Hex Key, Tip Size 5/64 in, Long Arm Length 3 3/16 in, Short Arm Length 5/8 in, Black Oxide/ LONG ARM LENGTH: 3.188 INCHES NOMINAL SHORT ARM LENGTH: 0.625 INCHES NOMINAL WRENCHING SURFACE SIZE: 0.078 INCHES NOMINAL BOTH ENDS WRENCHING SURFACE SHAPE: HEXAGON BOTH ENDS EXTERNAL MATERIAL: STEEL OVERALL SURFACE TREATMENT: OXIDE OVERALL STYLE DESIGNATOR: 120 L-HANDLE