Material: Carbon Steel54 Hardened Steel Support Balls 5/16 in. DiameterStraight Pipe Thread (1-1/4 in. Deep)Two 5/16 in. Holes for Spanner WrenchLoad rating Ball Up is 551 lbs. (250 kg)Load rating Ball Down is 220 lbs. (100 kg)Cross Reference: Mathews B4551
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