General Tools S1274 Professional Gasket Punch Set, 10 Piece Set This professional gasket punch set offers everything you will need to make effortless punch holes in gasket material, leather, canvas, cardboard and soft sheet metal This 10 piece kit features nine hardened and tempered punches and a self-centering steel mandrel The interchangeable punches are threaded for a tight, secure fit to the mandrel while in use The set includes gasket punch sizes 1/4, 5/16, 3/8, 7/16, 1/2, 5/8, 3/4, 7/8, and 1 inch The entire gasket punch set is packaged in a fitted plastic case for easy storage