À About this item Material: Each bit is made of high speed steel which offers precision and hardening. Feature: The titanium coating ensures sustainability and the sharpness of each wick helps to reduces friction and achieves operate at high speed a lower temperature. Also for better resistance to Size: Set includes 3 step drill bits, 1 taper drill bit, 6 countersink drill bits, countersink, 1 multi-drill saw and 1 central punch. All drills come with a 1/4 hex shank for quick switching to power tools. Advantage: Process different types of diameter holes in one step, this which saves you a lot of trouble. Wide application: can be used anywhere. for many different materials such as metals, mild steel, wood and plastic. Specification: 3 HSS step drills coated with titanium 5/9/14 (4-12/20/32 mm). Laser step size marking allows precise drilling. 6 sink drill bits: 6.3, 8.3, 10.4, 12.4, 16 .5, tip 20.5mm-90°, three cutting edges, ideal for deep milling of metals, mild steel, non-ferrous