7/16 Black Spline Drive Tuner Lug Nuts Small Diameter Wheel Locks With Key (7/16-20 Thread Size) (24) Spline tuner lug nuts are designed to fit aftermarket wheels that require a slim lug nut for tight lug holes. Each black spline lug nuts contains (1) 6-point spline tuner lug key. Dual 3/4" & 13/16" hex key. Please refer to the photo's for lug dimensions. Cold Forged. Lug nuts are heat treated and thru-hardened for max durability and tensile strength. Unlike other electro plated color lug nuts ours gives maximum resistance to color stripping.