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) 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. 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. 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: Kueohse