SERIESinner diameter of the eyehole(mm)01255282/9257hongyan62 Feature:High strengthAnti-corrosionEnvironmental protectionHeavy-dutyCNC minimum tolerance: +/-0.01mForge minimum tolerance: +/-0.5mmSurface finish: Heat treatment, Induction hardening, carbonizinmore details: 1,material:45#steel or 40Cr 2,means:forging or casting 3, the inner diameter of the back surface"s standard level:165mm,which could be broaden 4,the distance between the two fork are different 5,we could make a change on the sample according to your requests more pictures: