From Bimecc, this installation kit includes 24 10 Spline small diameter, closed end, zinc lug nuts and Key. Bimecc spline key for smaller vehicle applications such as passenger cars, small SUVs and small trucks. 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.