AMZCNC Manual Knockout Punch Kit, Heavy Duty Metal Sheet Knock Out Box Hole Cutter Conduit Punch Driver Die Set ((Conduit Hole Size) 1/2" Knockout Punch)

I was installing an electrical system for a 3200 sqft mixed-use building. Everything was surface conduit with 4” boxes and pull boxes. Multiple boxes needed a hole or a different size hole and these punches came to save the day. I imagine a hand wrench or socket set could be used, but I used cordless impact wrench and it gave me the hole I needed within 15 seconds. It worked well in a tight space and was way better over a hole saw.I’d punch out the smaller plug and use the hole cutter for the larger needed hole. (1/2 knockout to get 3/4; 3/4 knockout to get a 1”). I didn’t try it, but I think the 3/4 punch bolt is larger so you can’t use a 1/2” knockout for a 1” hole.

Makes a neat hole in sheet metal. Requires a 0.525” pilot hole in order to do the job. So you’ll want to buy a 9/16” drill bit to make the pilot hole.

Works well and cuts clean.

Exactly what I ordered and on time

I had to return this because I picked the wrong size, but I was very impressed with the quality of construction and packaging. A similar item of lesser quality was $69 at a hardware store.

The functionality of this is spot on....but someone didn't think to include a storage box for this set.

These worked perfectly. The only thing that would make them nicer is if the dies had flat surfaces so open end wrenches could be used to open them back up after punching the hole. As it is, we had to use locking pliers to do it. These are made of dies that are so hard that we actually wore out once set of locking pliers by wearing the teeth down, so I had to buy more pliers! I feel that flat surfaces to make the dies fit open end wrenches would have avoided that problem.

Very good quality