Zephyr 5/16” Socket Head (Hex-Allen) Insert Bits, For Self Tapping Screws Description:

Zephyr Socket Head (Hex-Allen) Insert Bits are heat treated in small lots to guarantee consistent quality. Zephyr’s unique Z-Forge process assures an exact dimensional fit in the recess. Zephyr Screwdriver Bits will give you the truest fit, longest performance and the least cam-out and product damage of any available screwdriver bit at any price. Zephyr Socket Head (Hex-Allen) Insert Bits have served the aerospace and automotive industries with high quality, technically innovative tools produced in a manufacturing environment that features intense quality control and superior customer service.