6 Point Spline Drive Tuner Socket Key Tool for Six-Spline Wheel Lock Lug Nuts - 17.6mm Inner Diameter - Compatible with 19mm (3/4") and 21mm (13/16") Hex Sockets 1pc This spline key is compatible with 6-sided Spline Type Tuner Locking Lug Nuts with 12x1.5, 12x1.25, 1/2" threads. Works with Multiple Hex Socket Sizes: 19mm, 3/4", 21mm, 13/16" Hex Sockets Inner Diameter: 17.6mm. Please double check your lug nut before purchasing; this is for 6-sided spline lug nuts, as there are multiple types and size tuner locking lug nuts on the market. Special coating provides exceptional appearance and corrosion resistance This listing is for 1 Socket Key <span class="a-text-bold">Splines: </span>6-Point <span class="a-text-bold">Inner Diameter:</span> 17.6mm <span class="a-text-bold">Outer Diameter:</span> 23.5mm <span class="a-text-bold">Color:</span> Black <span class="a-text-bold">Material:</span> Steel <span class="a-text-bold">Process: </span>Heat treatment Please note that this socket is only compatible with tuner style 6-spline lug nuts. Please see other listing for 7-spline socket key. NOT designed to work with standard Hex lug nuts. Perfect as a replacement for a lost or missing socket key. Can be used with both 19mm and 21mm Hex sockets. Standard Hex socket not included