Double Cut Steel design reduces pulling action, chip size and ensures rapid stock removal. Solid carbide brazed to steel shanks.SA-51 / Cylinder, SB-51 / Cylinder w/ endcut, SC-51 / Cylinder w/radius end, SD-51 / Ball, SE-51 / Oval, SF-51 / Tree w/ radius end, SG-51 / Tree w/pointed end, SM-51 / Cone and SN-51 / Inverted Cone