Drill America 17/64in x 12in Cobalt Aircraft Extension Drill Bit pneumatic accessory

Drill America 17/64in Cobalt Extension Bit

This 12-inch cobalt aircraft extension drill bit is designed for deep-hole drilling in hard metals. The heavy-duty split point reduces walking and starts cleanly on contact. Cobalt steel construction resists heat and wear during extended use. It suits mechanics and fabricators who need reach beyond standard jobber lengths.

Replaces shorter bits when depth

Standard-length bits cannot reach the full 12-inch overall length this tool provides. The cobalt alloy outperforms high-speed steel in stainless steel and other tough alloys. The jump is worth it when flute length of 2-7/8 inches and the decimal equivalent of .2656 match the hole specification. It is not for buyers who need a shorter bit or a different diameter.