3/8" Drive Metric 12 mm mm Hex Drivers

Designed for use with pneumatic or cordless impact guns. Optional retaining ring ensures positive attachment to anvil. Manufactured from special alloy steel and heat treated for optimum strength and durability. Williams® bits are designed with a precise fit and tight tolerances to prevent slippage and disengagement. Outperforms one-piece design models – our two-piece design makes replacement economical and convenient. Bits can be easily replaced by hand - no need to put them in a vice and punch them out with a hammer