Description Manufacturer part #: 12.70 Technical Description Features American Metric Name Single Sheave size 2 1/4 in 57 mm Max line size 7/16 in 12 mm Overall Height 4 1/4 in 109 mm Weight .4.3 ounces 122 g Breaking Load 2,204 lb 1,000 kg Max. Working Load 617 lb 280 kg