Hex Key, Tip Size 10 mm, Long Arm Length 4 19/64 in, Short Arm Length 39 mm, Black Oxide/ OVERALL LENGTH: 109.0 MILLIMETERS NOMINAL WRENCHING SURFACE SIZE: 10.0 MILLIMETERS NOMINAL BOTH ENDS WRENCHING SURFACE SHAPE: HEXAGON BOTH ENDS EXTERNAL SPECIAL FEATURES: 25 PER PKG MATERIAL: STEEL OVERALL STYLE DESIGNATOR: 120 L-HANDLE