All Chromed including the hardware Axle shafts are machined from heat-treated Chrome moly steel, triple step chrome-plated, then machine polished and ground to a finish tolerance of + or -.0005" Rear axle nuts are welded to the shaft with a full weld penetration, then machined smooth before final machine polishing and plating Axle is 3/4" diameter Replaces OEM 41580-79