are square hole punches available?

I have not seen any made by Neiko but you can find square hole punches depending on application. If you want it for paper applications, EK Tools makes one. If you want it for wood applications, Lee Valley Tools makes one that you drill an undersize hole first then use their punch to square it up. For metal, Greenlee makes a manual knock-out punch for square holes (up to 14 gauge mild steel). Hassay Savage Co. makes a Rotary square punch (it is a type of Broach). Also, there are broach kits out there. I am sure there are others if you do some research.

Will this tool cut a hole in a copper washer? I had another metal punch that punched through a couple of times, but then broke.

I cut 20 mil (24ga, 0.5 mm) copper sheet all of the time. I have cut 28 mil (0.7 mm) sheet easily. It doesn't do 40 mil (1 mm) very well as the jaws are open very wide. I think most copper flat washers will be more like 0.7 mm and so I should be fine for you. If you want to send me a few washers I'll try them for you. Let me know and I'll give you my address.

ASIN	B0002T87E0
Best Sellers Rank	#108,566 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #201 in Hole Hand Punches
Brand	Neiko
Brand Name	Neiko
Color	Silver
Colour	Silver
Country Of Origin	China
Customer Reviews	4.5 out of 5 stars 1,330 Reviews
Global Trade Identification Number	00837013026143
Hole Count	10
Hole count	10
Included Components	Large Hollow Hole Punch Set
Item Type Name	Interchangeable Large Hollow Hole Punch Set \| 10 Piece \| Heavy Duty \| Includes Tool Carrying Case
Item Weight	816 g
Item weight	816 g
Manufacturer	Ridgerock Tools Inc.
Material	Alloy Steel Plastic
Material Type	Alloy Steel Plastic
Operation Mode	Manual
Operation mode	Manual
Pin Hole Diameter	2.54 Centimeters
Sheet Count	25
UPC	837013026143
Unit Count	1 Count

02614A Interchangeable Large Hollow Hole Punch Tool Set, 10 Piece, Gasket Maker, Heavy Duty Punch, Includes Carrying Case, Leather Punch, Black

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