9/16 Chrome Duplex Spline Drive Tuner Acorn Buldge XL Long Lug Nuts Small Diameter Wheel Locks With Key (9/16-18 Thread Size) (20) Spline tuner lug nuts are designed to fit aftermarket wheels that require a slim lug nut for tight lug holes. Each set of chrome spline lug nuts contains (1) 7-point spline tuner lug key. Dual 7/8" & 13/16" hex key. Please refer to the photo's for lug dimensions. Lug nuts are cold-forged and thru-hardened for increased strength. Unlike other electro plated color lug nuts ours gives maximum resistance to color stripping. Closed-end design prevents rusting.