The Makita® Oval Punch, 3/8” x 25/32” (10 x 20 mm) is ideal for punching holes in general steel and stainless steel. The oval punch is for use with the Makita® Oval Die, 3/8” x 25/32” (10 x 20 mm), model SC00000258 (sold separately). The oval punch has a metal plate thickness capacity range of 5/64” (2 mm) to 5/32” (4 mm) in general steel and 1/8” (3 mm) to 5/32” (4 mm) in stainless steel. It installs quickly and easily for user convenience.