X4 heavy duty lower bulkhead. Improves durability in hard crashes. Features centering pins for effortless construction and consistent geometry settings. The bulkheads feature a super low anti-roll club mounting position that allows the anti-roll club wire to be placed directly under the drive shafts to significantly reduce the CG. The bulkheads function 1mm milled grooves the ball bearing hubs that moved the bulkheads 1mm closer to the framework center line from each part. This bulkhead fits front right side and back left side. Created from premium Swiss 7075 T6 aluminum, black anodized.