Heavy Duty 10 Pc Hollow Punch Kit W/Case Tool Set Gasket Leather Rubber + Case Features: ! 1 Pin Point Of Punch Shaft, 9 Punch Blade: SAE(MM), Size, 3/16"(5mm), 1/4"(6mm), 5/16"(8mm), 3/8"(10mm), 1/2"(12.5mm), 5/8"(16mm), 25/32"(20mm), 1"(25mm), 1-1/4"(32mm) Punch quick and accurate washers and gaskets on the job. Use on rubber, leather, copper, soft brass, and other materials. Saves you time and money in the shop. Making gaskets from stock material.