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.

Drill two pilot holes in Hoffman pull box. Enlarge pilot holes for the drawstud. Knock out the two holes Done in five minutes. Works just like the 'Green' brand but only time will tell how long it lasts.

Like new at a good price.

Worket perfectly for me

really like it compared to greenlanes. The lotus shape cuts evenly