Bordo reduced shank HSS drills are ground and then a black finish is achieved by steam tempering, a thermal process resulting in a porous tool coating. 16mm 1/2″” Reduced Shank Drill Reduced shank HSS twist drill. 118º notched point with 30º helix. Notched point is a variation on the standard chisel point, providing faster starting and reduced drill wander. 118º point angles are ideal for use in materials such as mild steel and cast iron. The 118º point creates easily controlled chips which are wide and thin.
