EXACT FACTORY SPECIFICATIONS: Includes 20 7/16 spline Lug Nuts ｜ 7/16-20 Thread ｜ 21mm 0.84" Long ｜ 6 Spline Car Hex ｜ 60 Degree Conical Seat ｜ True One-Piece Construction Heat Treated Carbon Steel Construction with Chrome Finish PRECISION FITMENT ENGINEERED FOR AFTERMARKET WHEELS. Compatible on vehicles with 7/16-20 threads as found on Buick Regal 1973-81 ｜ Chevrolet Bel Air 1959-81 ｜ Camaro 1967-81 ｜ Chevelle 1964-72 ｜ Corvette 1953-82 ｜ Monte Carlo 1970-81 ｜ Nova 1975-79 ｜ Oldmobile Cutlass Supreme 1978-89 ｜ Pontiac Firebird 1967-82 ｜ Grand Am 1973-74 ｜ Grand Prix 1977-87 ｜ GTO 1964-67 ｜ LeMans 1975-77 Confirm capatability with AMAZON CONFIRM FIT. FOR AFTERMARKET WHEELS Only DESIGNED & TESTED IN USA: These7/16 lug nuts 20 pack 6 Spline Car Hex OE Acorn Spline Lug Nuts are specifically designed for aftermarket wheels. OE Acorn Spline Lug Nuts are mainly used on wheels with hub caps. 1 Piece Construction design ensures reliable clamping force and long‑term durability under daily driving conditions. RELIABLE PERFORMANCE & CORROSION RESISTANCE: Premium multi‑layer Chrome coating tested for 72‑hour salt‑spray corrosion protection. Ideal upgrade for your vehicle. Designed for RAINY climate and AFTERMARKET wheels. Cold Forged carbon Steel. High quality Precise 7/16-20 threads. Built to SAE Standards COMPLETE 20 Pcs SET: Full lug nuts set for four wheels Chrome Lug Nuts with 60 Degree Conical Seat 6-Spline lug nuts ready for direct installation. Upgrade now to your vehicles appearance and the safety you are looking for. Wheel Accessories Parts 20 Pcs 7/16"-20 Thread OE Acorn 21mm 0.84" Long Spline Lug Nuts Chrome 6 Spline Car Hex Fits Many Classic Chevrolet, Buick, Pontiac Vehicles