Bordo 2651-S1 – Drill Set – Reduced Shank – Imperial

118 notched point 30 helix reduced shank drill. BRIGHT/BLACK FINISH These drills are ground and then a black finish is achieved by steam tempering, a thermal process resulting in a porous tool coating. This surface aids chip flow and heat dissipation. The drill is then ground a second time to achieve a bright finish on the shank and cutting edges.2651-5/8: 5/8″ 1/2″ Reduced Shank Drill2651-3/4: 3/4″ 1/2″ Reduced Shank Drill2651-7/8: 7/8″ 1/2″ Reduced Shank Drill2651-1: 1″ 1/2″ Reduced Shank Drill