Hex Key, Tip Size 3/16 in, Long Arm Length 4 1/2 in, Short Arm Length 15/16 in, Black Oxide/ LONG ARM LENGTH: 4.125 INCHES NOMINAL SHORT ARM LENGTH: 0.844 INCHES NOMINAL WRENCHING SURFACE SIZE: 0.156 INCHES NOMINAL BOTH ENDS WRENCHING SURFACE SHAPE: HEXAGON BOTH ENDS EXTERNAL MATERIAL: STEEL OVERALL SURFACE TREATMENT: OXIDE OVERALL STYLE DESIGNATOR: 120 L-HANDLE