Hex Key, Tip Size 4 mm, Long Arm Length 2 33/64 in, Short Arm Length 24 mm, Black Oxide/ OVERALL LENGTH: 68.0 MILLIMETERS NOMINAL WRENCHING SURFACE SIZE: 4.0 MILLIMETERS NOMINAL BOTH ENDS WRENCHING SURFACE SHAPE: HEXAGON BOTH ENDS EXTERNAL SPECIAL FEATURES: 25 PER PKG MATERIAL: STEEL OVERALL STYLE DESIGNATOR: 120 L-HANDLE