Greenlee 745H-1/2 knockout punch hand tool

Knockout punch for 1/2-inch conduit

The Greenlee 745H-1/2 is a hand-held knockout punch designed to cut clean, accurate round holes in stainless steel and mild steel up to 10 gauge. It produces a nominal 0.885-inch hole that matches 1/2-inch conduit and pipe size. The tool is intended for electricians and maintenance technicians who need reliable hole-making in junction boxes, panels and enclosures. It operates with a simple hand-driven mechanism that requires no external power source.

Replaces manual drilling and step-bit work

This punch eliminates the time and inconsistency of drilling pilot holes followed by step bits or hole saws in thin-gauge metal. The slug splits in half and falls free from the die and stud, clearing the workpiece automatically. The jump is worth it when repeatability and speed matter on electrical installations, especially in stainless steel where drill bits wear quickly. It is not suited for thicknesses beyond 10-gauge mild steel or for non-round cutouts.

Consistent performance through repeated use

The cutting geometry maintains hole quality across multiple operations without the drift or burr buildup common with twist drills in tough alloys. Because the slug ejects cleanly, there is no need to stop and clear waste between holes, sustaining workflow on larger jobs. The hand-held format keeps the operator in direct control of feed pressure, reducing the risk of distortion on thin panels. No hydraulic or battery system is required to maintain output.