#3 x 12" Cobalt Aircraft Extension Drill Bit Quantity:1 The bits are made of

The bits are made of S2 steel and have a zinc-phosphate coating that resists corrosion

Part Number: M16C90SHCS12Z/D

Finish Gold Oxide

The set includes Phillips and slotted bits as well as a twist-to-lock socket rail that keeps the sockets securely organized

Size 7/16"-80

#3 x 12" Cobalt Aircraft Extension Drill Bit Quantity:1 The bits are made ofProduct 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