6pcs hollow punch set Includes: 3/16, 1/4, 5/16, 3/8, 7/16, 1/2" The fast, easyway to punch accurate holes in gasket material, light gauge sheet metal, vinyl, leather, and more.High carbon construction with precision ground flutes and cutting edges.Easy to grip knurled shanks.6Pcs set includes: 3/16, 1/4, 5/16, 3/8, 7/16 and 1/"Order No. 830-8006