#52 x 12" Cobalt Aircraft Extension Drill Bit BoltsandNuts.com the teeth are hardened to

the teeth are hardened to 45–50 HRC and should not chip or strip even on fasteners up to Grade 8 or Class 12

Part Number: 50F700HCSSS

All of the tools come stored in a sturdy

The gradually tapered alignment punch is machined to precise tolerances and is designed to align holes to position multiple parts for accurate assembly

Width: 5-1/2"

#52 x 12" Cobalt Aircraft Extension Drill Bit BoltsandNuts.com the teeth are hardened toProduct Description Cobalt drill bits are are effective in drilling tough, high tensile strength materials such as cast iron, inconel, stainless steel and titanium. They display high red hardness, permitting speeds up to 30% greater than with conventional M2 high speed steel. They have a 135 split point tip for fast penetration and accurate drilling. Compared to a conventional 118 degree tip, these drills wont go "walking" on you. Ideal for drilling