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. Gardner Bender four-point knockout punches and dies are designed to punch clean， round holes through mild steel or other soft metals. Sizes are available to specifically permit fast and easy installation of electrical conduit and pipe in all commonly available increments.

4-point design allows slug to drop automatically without splitting

For 10-Gauge mild steel and 12-Gauge stainless steel

Punches hole designed for 0.5 in. pipe or conduit

Actual hole diameter 0.875 in.