TCT Hole Saw Set, 2-Pack of 5/8" (16mm) Heavy Duty Tungsten Carbide Tipped Hole Cutters for Stainless Steel Mild Steel Copper Iron Brass Plastic and More, with Titanium-Plated Pilot Drill Bits

Got 15 holes drilled in a trailer for marker lights on one bit, it was cutting just as good on the last hole as the first. For the price we'll worth it.

Great drills and works as expected.

As other reviewers have commented, the pilot bit wasn’t very effective. However, the hole saw was awesome. I just drilled a 1/8 pilot and followed up with progressively larger carbon steel bits until it was just shy of the furnished pilot bit. I used thread cutting oil and was very impressed with the hole saw, particularly since my expectations were low after struggling with the pilot bit.

The carbide cutter works, but you have to go slow, I used a pre-drilled hole, and the drill bit that comes with the cutter, snagged something and broke, “cobalt” drill bits are the best next to carbide drill bits. But overall, always use cutting fluid. I recommend this design for drilling.

Cut through like it was nothing. Just what I needed to get through a foundation.

This product was not worth it if I could get a refund without returning it I would but I threw it away. This product was terrible and the bit snapped while I was drilling.

Well made ! Compared to others at this cost they are the best hands down! Easy to use and very tough

I have used these in cordless drill, drill press and mag drill they have preformed great very impressed and they are still very sharp cut several holes mostly in half inch steel