Description S.steel mini blocks, single web block with becket, sheave Ø 40, SWL 500 kg Manufacturer part #:00421 Technical Description Features American Metric Ø sheave (D) 1.57 in 40 mm Side bearing Delrin balls Delrin balls Weight 0.132 lbs 60 gr Ø max line 0.31 in 8 mm SWL 1102.3 lbs 500 kg Material S.steel S.steel Sheave material Plastic Plastic