Chesterton Gasket Cutter Tool utilizes a sturdy brass cutting head that slides easily over a variety of gasket materials. The unique design gasket cutter allows you to quickly adjust your cutting size from 1/4" I.D. – 37" O.D. (6 mm I.D. – 940 mm O.D.). Specially designed cutting blades are held securely, ensuring consistent and repetitive cuts in material up to 3/4" (19 mm) thick. This tool set includes a 18" (457 mm) cutting board with fiber pad.