Product Overview Drive Size: ½″ Square Drive — Built To Fit Common Impact Wrenches And Ratchets Bit Type: Hexagon (Allen) Bit — Fits 5/16″ Hex Fasteners Length: Typically Around 55 Mm, Giving Balanced Reach And Control Material & Finish: Machined From Chrome-Molybdenum Steel With A Black Phosphate Finish — Engineered For High Torque And Corrosion Protection Construction: One-Piece Design — Stronger Than Two-Piece Bits, Ideal For Repeated Impact Use Key Benefits Impact-Rated Durability: Made From Robust Cr-Mo Steel With Thick Walls, This Bit Resists The Shock Loading Of Impact Wrenches Better Than Standard Steel Bits. Tight Fastener Access: With A Compact ~55 Mm Length, It Strikes A Good Balance—Long Enough To Reach Recessed Bolts, Yet Short Enough To Stay Stable Under Torque. Precise Fit & Strength: Hex Profile Provides Strong Surface Contact With Fastener Flats, Reducing Stripping And Enhancing Torque Transfer.