punch hole metal

Most metal knockout punch kits cover conduit sizes from 1/2" up to 4" on larger 10–15 ton kits. Smaller 6‑die 10‑ton kits commonly cover 1/2" through 2".

Search results show hydraulic knockout punch driver kits for metal conduit holes, plus manual tabletop and hand punches designed for paper, grommets, and light craft materials.

Drilled diameters depend on kit size: larger 10‑die/15‑ton kits list drilled sizes from about 7/8" up to 4 9/16", while 6‑die/10‑ton kits list sizes from about 7/8" up to 2 7/16".

Dies and punches are commonly made from alloy steel (often specified as 40Cr), while pump bodies and other tool components are described as 45# steel or aluminum alloy depending on the kit.

Convenience and safety features noted include a rotatable on/off knob or quick pressure‑release, a safety valve that vents at maximum pressure, anti‑skid grips, flexible pressure hoses, and rotatable heads for working at different angles.

Paper/office punches make roughly 1/4" holes and show sheet capacities around 5–10 sheets. A grommet press includes three die sizes (#0, #2, #4) and ships with 900 grommets (300 of each size).