Punch shaft is constructed with a rubber sleeve for a comfortable grip, built in spring loaded center punch with pilot tip for accurate positioning. Interchangeable punch heads have a knurled to easily screw securely into the punch shaft, safe and convenient. Hollow punches are made of heat treated carbon steel for maximum strength and sturdiness, ensuring clean and accurate cut/punch. Can be used on rubber, leather, vinyl, plastic, cardboard, copper and many more materials. hollow hole punch set includes 1 x Punch shaft and 13 x hole punch head sizes in 3/16 inch (5mm), 1/4 inch (6mm), 5/16 inch (8mm), 3/8 inch (10mm), 7/16 inch (11mm), 1/2 inch (13mm), 5/8 inch (16mm), 3/4 inch (19mm), 7/8 inch (22mm), 1 inch (25mm), 1-1/8 inch (28mm), 1-1/4 inch (32mm), and 1-3/8 inch (35mm) Easy to use - Screw on the head, hammering on the top of the punch shaft to punching a hole on your material. You can also remove the center pin to cut disks with no middle hole., Weight: 3.1305641204 Pounds, Manufacturer: Aboiled