HSS Cobalt Drill Bit Aircraft Extension Long 3Pcs 3/8 in. x 6 in.

Max-Craft HSS Aircraft Extension Drill Bit is made of the high quality material of M35 Cobalt Steel with 135 Deg. Split Point for better self-position and quick easy penetrating hard material of steel and metal. The 6 total length is quite long for deep hole drilling for various of working pieces. The aircraft extension drill bit is fully grinded processed to ensure the stable and high quality performance.