OPF series, single web block, sheave Ø 50, SWL 600 kg Manufacturer part #:00509 Technical Description Features American Metric Ø sheave (D) 1.97 in 50 mm Side bearing Delrin balls Delrin balls Radial bearing composite fibre composite fibre Weight 0.141 lbs 64 gr Ø max line 0.39 in 10 mm SWL 1322.8 lbs 600 kg Material Aluminum Aluminum Sheave material Plastic Plastic