Description Antal OPF Block D 50 with Snap Shackle OPF series, single block sheave Ø50 Technical Description Features Metric American sheave (D) 1.97 in 50 mm SWL 1322.77 lb 600 kg 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