EXACT FACTORY SPECIFICATIONS: Includes 20 7/16 spline Lug Nuts ｜ Car Spline Style ｜ 7/16-20 Thread ｜ 35mm 1.38" Long ｜ Spline Hex｜ 60 Degree Conical Seat｜ One-Piece 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: 3/4" 19mm Hex Acorn Bulge Lug Nuts are specifically designed for aftermarket wheels. One-Piece design ensures reliable clamping force and long‑term durability under daily driving conditions. RELIABLE PERFORMANCE & CORROSION RESISTANCE: Premium multi‑layer Chrome coating tested for 48‑hour salt‑spray corrosion protection. Ideal upgrade for your vehicle. Designed for AFTERMARKET wheels. Cold Forged carbon Steel. High quality percise 7/16 x 20 chrome lug nuts. Built to SAE Standards COMPLETE 20 Pcs SET: Full lug nuts set for four wheels. These Chrome 7/16 x 20 splined lug nuts come 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 Car Spline 35mm 1.38" Long Lug Nuts Chrome Spline Hex Fits Many Classic Chevrolet Buick GMC Pontiac Vehicles