--- product_id: 298944462 title: "Defender Security U 10304 Chain Door Guard – Door Chain Lock for Door and Home Security, 3-5/16”, Solid Brass Construction with a Satin Nickel Finish" brand: "prime-line" price: "€ 30.98" currency: EUR in_stock: true reviews_count: 5 category: "Prime Line" url: https://www.desertcart.fr/products/298944462-defender-security-u-10304-chain-door-guard-door-chain-lock store_origin: FR region: France --- # 6-inch, 8-link welded steel chain Quick & easy screw mount installation Durable extruded brass with satin nickel finish Defender Security U 10304 Chain Door Guard – Door Chain Lock for Door and Home Security, 3-5/16”, Solid Brass Construction with a Satin Nickel Finish **Brand:** prime-line **Price:** € 30.98 **Availability:** ✅ In Stock ## Summary > 🛡️ Lock in safety, unlock peace of mind. ## Quick Answers - **What is this?** Defender Security U 10304 Chain Door Guard – Door Chain Lock for Door and Home Security, 3-5/16”, Solid Brass Construction with a Satin Nickel Finish by prime-line - **How much does it cost?** € 30.98 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.fr](https://www.desertcart.fr/products/298944462-defender-security-u-10304-chain-door-guard-door-chain-lock) ## Best For - prime-line enthusiasts ## Why This Product - Trusted prime-line brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Child-Safe Placement:** Install out of reach to prevent kids from opening doors alone—peace of mind for modern parents. - • **Robust Build Quality:** Crafted from solid brass alloy and reinforced steel chain for long-lasting, tamper-resistant protection. - • **Effortless DIY Upgrade:** Includes all fasteners for a hassle-free installation that fits most door types and styles. - • **Sleek Satin Nickel Finish:** Adds a contemporary, polished look that complements any professional or home environment. - • **Secure Ventilation & Viewing:** Keep your door slightly open for fresh air and safe visitor screening without compromising security. ## Overview The Defender Security U 10304 Chain Door Guard is a premium door security device featuring a 6-inch, 8-link welded steel chain and solid brass construction with a satin nickel finish. Designed for easy screw-mount installation, it allows safe door ventilation and viewing while providing child-safe security when installed out of reach. Compatible with various door types, this durable chain lock offers a sleek, professional look and reliable protection for homes and offices alike. ## Description Add an extra layer of entry door security with the Prime-Line U 10304 Chain Door Guard Lock. Designed for residential and light commercial applications, this classic chain-style security device allows doors to open partially for visitor identification and ventilation while helping restrict unwanted entry. It is an effective supplemental security measure for apartments, homes, offices, and other interior entryways. Constructed from durable extruded brass with an attractive bronze finish, this door guard is built for long-lasting performance while complementing a variety of décor styles. The 6 in. welded steel chain with 8 links provides dependable strength and controlled door opening when engaged. Its versatile design can be installed over or alongside the door casing, making it suitable for a wide range of door configurations. For added household safety, the lock can be mounted higher on the door to help limit access by young children. Installation is quick and straightforward with the included fasteners, making it an easy DIY security upgrade. Compare dimensions and installation requirements before purchasing to ensure proper fit. Review: Cerradura resistente - Buena calidad y resistencia del material de la cadena. Review: Parafusos não vieram no tamanho certo. - Os parafusos são maiores do que os buracos , tive que comprar parafusos novos ## Features - SECURITY LOCKING DEVICE –This U 10304 Chain Door Guard is a security locking device for doors, allowing a door to be slightly opened to allow safe viewing and ventilation. - CHILD-SAFE SECURITY DEVICE – This door chain lock can also be installed out of reach of children so they cannot open the door by themselves, providing additional child-safe door security. - EASY INSTALLATION - Installation is quick and easy – additional security for your home or office doors are within reach! Installation fasteners are included. - DURABLE CONSTRUCTION – This chain door guard is constructed of extruded brass with a satin nickel plated finish and a 6”, 8-link welded steel chain. It’s strong and durable and sure to last. - PRODUCT INFO – The 3-5/16” U 10304 Chain Door Guard can be used on a variety of door types and can be placed over or beside door casing. It features a 6-inch long, 8-link welded steel chain and all installation fasteners necessary for complete install. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B003VWPKQ8 | | Best Sellers Rank | #90,924 in Baby Products ( See Top 100 in Baby Products ) #847 in Door & Window Guards | | Brand | Prime-Line | | Brand Name | Prime-Line | | Colour | satin nickel | | Country of Publication | USA | | Customer Reviews | 4.5 out of 5 stars 2,473 Reviews | | Global Trade Identification Number | 00049793103048 | | Included Components | chain lock, keeper and fasteners | | Item Dimensions L x W x Thickness | 10.2L x 10.2W x 3.8Th Centimeters | | Item Type Name | Chain lock | | Manufacturer | Prime-Line Products (Home Improvement) | | Manufacturer Part Number | U 10304 | | Material | Brass Alloy Steel | | Material Type | Brass Alloy Steel | | Model Number | U 10304 | | Mount Type | Screw Mount | | Mounting Type | Screw Mount | | Number of Packs | 1 | | Number of Pieces | 1 | | Product Dimensions | 10.2L x 10.2W x 3.8Th Centimeters | | Product Finish Type | Satin Nickel | | Product Style | chain | | Style | chain | | UPC | 049793103048 | | Unit Count | 1.0 Count | ## Product Details - **Brand:** Prime-Line - **Colour:** satin nickel - **Finish Type:** Satin Nickel - **Global Trade Identification Number:** 00049793103048 - **Manufacturer:** Prime-Line Products (Home Improvement) - **Material:** Alloy Steel - **Number of Pieces:** 1 - **Style:** chain - **UPC:** 049793103048 ## Images ![Defender Security U 10304 Chain Door Guard – Door Chain Lock for Door and Home Security, 3-5/16”, Solid Brass Construction with a Satin Nickel Finish - Image 1](https://m.media-amazon.com/images/I/61S+fkd1IiS.jpg) ![Defender Security U 10304 Chain Door Guard – Door Chain Lock for Door and Home Security, 3-5/16”, Solid Brass Construction with a Satin Nickel Finish - Image 2](https://m.media-amazon.com/images/I/61sPXZyCYxL.jpg) ![Defender Security U 10304 Chain Door Guard – Door Chain Lock for Door and Home Security, 3-5/16”, Solid Brass Construction with a Satin Nickel Finish - Image 3](https://m.media-amazon.com/images/I/71XEOxL+1YL.jpg) ![Defender Security U 10304 Chain Door Guard – Door Chain Lock for Door and Home Security, 3-5/16”, Solid Brass Construction with a Satin Nickel Finish - Image 4](https://m.media-amazon.com/images/I/81WcZYgW+YL.jpg) ![Defender Security U 10304 Chain Door Guard – Door Chain Lock for Door and Home Security, 3-5/16”, Solid Brass Construction with a Satin Nickel Finish - Image 5](https://m.media-amazon.com/images/I/71SjWaYebkL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Cerradura resistente *by C***N on 16 April 2025* Buena calidad y resistencia del material de la cadena. ### ⭐⭐⭐ Parafusos não vieram no tamanho certo. *by D***S on 20 March 2024* Os parafusos são maiores do que os buracos , tive que comprar parafusos novos ### ⭐⭐⭐⭐⭐ Sturdy and easy to install *by A***R on 18 August 2026* Just what I expected and needed. ## Frequently Bought Together - Prime-Line U 10304 Chain Door Guard – Door Chain Lock for Door and Home Security, 3-5/16 In., Solid Brass Construction with a Satin Nickel Finish (Single Pack) - FATLODA 2 Pack Barrel Bolt Latch, Slide Bolt Latch 3 Inches Slide Latch Lock, Thickened Stainless Steel Sliding Lock for Door, Brushed Finish Sliding Bolt Lock, Sliding Bolt Latch with 12PCS Screws --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.fr/products/298944462-defender-security-u-10304-chain-door-guard-door-chain-lock](https://www.desertcart.fr/products/298944462-defender-security-u-10304-chain-door-guard-door-chain-lock) --- *Product available on Desertcart France* *Store origin: FR* *Last updated: 2026-10-15*