EXACT FACTORY SPECIFICATIONS: Includes 20 7 16-20 Lug nuts ｜ Open End Bulge Acorn Style Lug Nuts 7/16 - 20 Thread｜ 21mm 0.84" Long｜ 3/4" 19mm Hex｜ 60 Degree Conical Seat｜ True One-Piece Carbon Steel Construction with Zinc Finish PRECISION FITMENT ENGINEERED FOR AFTERMARKET WHEELS. Compatible on vehicles with 7/16 x 20 lug nut thread as found on 1973-1981 Buick Regal; Chevrolet 1959-1981 Bel Air, 1967-1981 Camaro, 1964-1972 Chevelle, 1953-1982 Corvette 1970-1981 Monte Carlo, and 1975-1979 Nova; Oldsmobile 1978-1989 Cutlass Supreme; and Pontiac 1967-1982 Firebird, 1973-1974 Grand Am, 1977-1987 Grand Prix, 1964-1967 GTO, and 1975-1977 LeMans. Confirm compatibility with AMAZON CONFIRM FIT. FOR AFTERMARKET WHEELS Only DESIGNED & TESTED IN USA: 3/4" 19mm Hex open ended 7/16-20 lug nuts Bulge Acorn style are specifically designed for AFTERMARKET WHEELS. Open End Bulge Acorn Lug Nuts are mainly used on wheels with caps that cover the lug nuts. Our One-Piece design ensures reliable clamping force and long‑term durability under daily driving conditions. RELIABLE PERFORMANCE & CORROSION RESISTANCE: Premium multi‑layer Zinc coating tested for 48‑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. These Zinc lug nuts 7/16-20 conical seat - 60 degree comes 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 Open End Bulge Acorn 21mm 0.84" Long Lug Nuts Zinc 3/4" 19mm Hex Fits Many Classic Chevrolet, Buick, GMC, Pontiac Vehicles