Description:

4.2mm Shank Diameter; 8.7mmDrill Bit Length. Twist Double End Drill Bits made of High Speed Steel, high hardness, good wear resistance and durability. This HSS Drill Bits surface Titanium coated, which increase the hardness of the drill bit and reduces heat buildup, make the twist drill bit more wear-resisting for longer life. Particularly successful in cutting through hard metals such as stainless steel and cast iron, although they can be used for softer materials, too.. No center punch is neededthe 135 Quick-Cut points are self-centering and penetrate quickly with less pressure. Will not "walk" or "wander".