From single parts to complete kits， Gardner Bender has versatile， durable hole-making products that contractors depend on. If you need to knockout， punch， notch， drill or insulate， Gardner Bender has the right tool for the job. The SP-7 interchangeable design allows you to select a 7/8 in. (22.2 mm) or 1-11/32 in. (34.1 mm) size punch. Whether you need an entire knockout set， or you're looking for a replacement part for a set you own， Gardner Bender has versatile， durable hole-making products that contractors depend on and ask for by name.

Spring loaded sleeve that increases the life and accuracy of the punch while providing a smoother cutting action

Easily punches "H" studs without damaging flanges

Automatic stripper

High-leverage design permits punching holes in aluminum studs and mild steel (up to 20-Gauge) with minimum effort

From the center of the punch to the back of the housing measures 2 in.

Interchangeable with most brands of knockouts

Includes tool， punch and die in heavy duty carrying case with handle