1-25/64" HSS Black & Gold Drill Bit with Reduced 1/2" 3-Flat Shank, Contractor Series BoltsandNuts.com The tips are made of

The tips are made of ASTM-E52100 bearing steel that's hardened to 47–53 HRC with nickel plating

Part Number: 37C400HCSAL

Diameter: 1/2"-13

Part Number: 87F350HCS8Y

1-25/64" HSS Black & Gold Drill Bit with Reduced 1/2" 3-Flat Shank, Contractor Series BoltsandNuts.com The tips are made ofProduct Description Contractor grade drill bit manufactured from M1 High Speed Steel and for use in a wide range of materials in the iron and steel families such aluminum, iron, steel and other metal drilling. Contractor Drill Bits have a 135 degree split point tip for self centering and reducing thrust. Compared to a conventional 118 degree tip, these drills wont go "walking" on you. They are black and gold surface treated. Reduced Shank Drills