Compatibility: Shimano older XTR/XT/LX/STX-RC spider arm lock ring
With 8 notch, Each tooth is approximately 3.9mm wide and with notch spaced approximately 13.5 mm apart
Maximum outside diameter is 43.5 mm. The width from inside to inside is approximately 38 mm.The hole in the center of the casting is 0.9 inches (22.5 mm) and will not fit on a 30 mm shaft.