Titanium Step Drill Bits Set Tool Hole Cutter Tool 10 45 INTL. These step drills have good chip removal ability. Giới thiệu sản phẩm 13pcs 1 4 Large HSS Steel Finish Titanium Length Approx. 3pcs HSS Steel Step Drill Bits. Large HSS Step Cone Drill Titanium Bit Set with case Intl.