Hex Key, Tip Size 2.5 mm, Long Arm Length 2 11/64 in, Short Arm Length 18 mm, Black Oxide/ OVERALL LENGTH: 55.0 MILLIMETERS NOMINAL WRENCHING SURFACE SIZE: 2.5 MILLIMETERS NOMINAL BOTH ENDS WRENCHING SURFACE SHAPE: HEXAGON BOTH ENDS EXTERNAL SPECIAL FEATURES: 25 PER PKG MATERIAL: STEEL OVERALL STYLE DESIGNATOR: 120 L-HANDLE