2 1/2-inch -4-inch cutting dies, heavy duty case and 1-1/8 inch draw Studs. This is an advanced Knockout tool used with a cordless drill to draw punch dies together for quick, accurate knockouts.

Features:
Unique 3 point cutting surface provides a cleaner, quicker and easier cut for 1-4 dies
Rated for 10 gauge stainless steel (3.5mm) as well as mild steel, aluminum, fiberglass and plastic
Works with max punch punches, max punch 360 and other popular knockout Tools
Cup creates Crimping effect on slug for easy removal
Will NOT bow panel or leave jagged edges