MB10T200E UB500E McKissick Top Swivel Overhaul Ball, 10 ton capacitySizes 4 short Tons through 30 short Tons are available with Crosbys S1316A positive locking SHUR LOC hook, which may be used for lifting personnel. Meets the intent of OSHA Rule 1926. 1431(g)(1)(i)(A) and 1926. 1501(g)(4)(iv)(B). Design Factor 4: 1 The top swivel design on the UB 500 assures the ball remains stationary if the wireline spins. The swivel incorporates a sealed roller thrust bearing together with a grease fitting for easy lubrication.