Sterling 10.25 Differential Cover made from 3/8" steel. CNC Laser cut and CNC Press formed 8 times from one piece. The ultra thick 3/8" flange resists pulling off of the sealing surface while dragging the differential, while the 3/8" body resists denting even during the most abusive circumstances. Includes weld on skull logo and 3/8" Grade 8 hardware. Welded and Machined flat for a great fit.