TW4AD Zephyr Tool 5/16” Tri-Wing #4 Insert Bits Description: Zephyr Tri-Wing ® 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 Tri-Wing 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.

Shank Size: 5/16” Point Size: #4 Overall Length: 1 1/4” Apex Equivalent Part Number: TWE-4