Bimecc spline key for smaller vehicle applications such as passenger cars, small SUVs and small trucks. (1-Pack) Bimecc 10-spline lug key (for 10-Spline lug nuts/lug bolts ONLY). The socket comes with a dual 19mm (3/4") and 21mm (13/16") Hex drive. Suitable for use with hand wrenches only; NOT for use with impact tools.