Through-hole allows access with hex wrench to hold clutch adjuster screw while simultaneously tightening the adjuster lock nutDeep socket allows tool to recess into clutch basket and can be driven with 11/16'' combination wrench or adjustable wrenchCompact design fits easily in a saddlebag or tool wrapFor use on all '98 and later Big Twin Harley-Davidson models with an 11/16'' clutch adjuster lock nut (excluding applications with hydraulic clutches).