C.S. Osborne Grommet Hole Cutter. Forged, hardened and polished edge. Inside tapered for easy clearance. Use with corresponding grommets and setting dies. Made in USA. Size number : 5A Hole diameter : 5/8" You should go up a size on the hole cutter if you are using heavy material or using spur grommets. Other size cutters are also available in our shop.