Stage 8 DNA-44 X-Lock Locking Spindle Nut Assembly for Dana 30, 35, 44 and GM Corporate 10 Bolt Spindles 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