KSP 20PCS M14x1.5 Ball Seat Lug Bolts are designed for Audi and Mercedes vehicles using R12 spherical seat wheels. Each bolt is made from cold-forged carbon steel for exceptional strength and reliability under high torque. The black anti-rust coating provides multi-layer corrosion protection, ensuring long-lasting appearance and performance even after repeated use. With a 28mm shank length and 17mm hex head, these bolts provide a precise fit for OEM or aftermarket wheels, preventing loosening and improving driving safety. The smooth ball seat design allows even load distribution on the wheel hub, reducing vibration and wear. Engineered to 10.9 grade hardness, KSP lug bolts deliver secure rim mounting and consistent torque retention. Each set includes 20 bolts for a complete wheel installation or replacement, ideal for drivers seeking both durability and a clean, factory-like look.