- Norton Cutoff Blade - 4in. Dia, 15,280 RPM, Model# 66243537236-9 Cut pipe, sheet metal and auto body panels, studs, angle iron and tubing Unique reinforced design for strength 1/16in. for quick, clean cutting 4in. blades for Black &amp; Decker , Hitachi , Jepson , Makita and Ryobi right angle grinders