Material: Carbon Steel108 Hardened Steel Support Balls, 5/16 in. Diameter3-1/2 in. Straight Pipe Thread (1-3/4 in. Deep)Two 5/16 in. Holes for Spanner WrenchLoad rating Ball Up is 661 lbs. (300 kg)Load rating Ball Down is 264 lbs. (120 kg)Cross Reference: Mathews B4560
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