A Set Of 14 M42 8 Percent Cobalt High Speed Steel Twist Drill, And Wood Plastic. HIGH QUALITY MATERIAL: 8% Cobalt High Speed Steel M42 provide extended tool life compared to ordinary drill bits. TWIST DESIGN PERFORMANCE: PRECISE 135SPLIT POINT, gold oxide finish and round straight shanks. Prevent walking, clear chips and particles faster.Produced by precision fully ground which ensures chips move smoothly. PROFESSIONAL WIDELY USE: M42 Cobalt HSS is more suitable for hardened material. Particularly successful in cutting through hard metals such as stainless steel, cast iron, high temperature alloy, titanium alloy, hard plastics and woods, and also can be used for softer materials. SIZE INCLUDED: 14pcs jobber length drill bit set with plastic storage case including sizes:1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 3/16", 7/32", 1/4", 5/16", 3/8", 1/2". VERTICAL OPERATION: Vertical operation can make the blade tip evenly stressed, which can avoid damage to the blade tip due to uneven force.