Stage 8 3903 Turbo Locking Bolt Kit with 10mm-1.25 x 25mm Bolts Grade 8 bolts will not stretch when hot Duplex nickel finish for a superior look and corrosion resistance Double hex head includes 3/16 inches recessed allen head for easy installation Removable and reusable Can visually inspect; no need to put a wrench on to check tightness