These hole punches use together with hydraulic hole punch tool, different sizes are accept.
Our factory standard knockout hole punches:¢16mm, 20mm, 22mm, 26mm, 27.5mm, 32.6mm, 34mm,
39mm, 43mm, 49mm, 51mm, 60.8mm, 63mm, 76mm, 80mm, 89mm, 100mm, 114mm, 125mm and etc.
If you are looking for square hole sizes, maybe you can find the just right size here:
32mm*32mm, 45mm*45mm, 45mm*92mm, 41mm*41mm, 151mm*151mm and etc.
Just in case you can not find your right hole sizes here, please do not worry, you can call us or send us an email for a check.