This Slug-Out Set includes 4 of the most popular punch and dies sizes (1/2 in., 3/4 in, 1 in. and 1-1/4 in.) packed in a durable carrying case. Gardner Bender 4 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.