2.5mm Ball End Hex Wrench Bit x1. Machine-crafted in chromium molybdemum vanadium steel for a precision design that minimizes the potential for screw head damage. The bit is magnetic. For use on 2.5mm hex head screws. Can be used at angles up to 20 degrees from the perpendicular. Bit size: 2.5mm hex, 100mm length. Compatible with the Ratcheting Screwdriver PRO in Item 74152, and electric screwdrivers that can take 6.35mm shank bits.