Description Antal OPF Block D 50 with Snap Shackle OPF series, single block sheave Ø50 Technical Description Features American Metric Ø sheave (D) 1.97 in 50 mm SWL 1322.77 lb 600 kg Ø max line 0.39 in 10 mm Shackle Mod - 055SS Side bearing - Delrin balls Sheave material - Resin Radial bearing - Composite Fibre Material - Aluminum Weight 0.20 lb 90 g