Description Antal Shackle Block D40 with Becket Bush Head Stainless Steel Mini blocks, single block with becket sheave Ø40 Technical Description Features Metric American sheave (D) 1.57 in 40 mm SWL 1102.31 lb 500 kg max line 0.31 in 8 mm Side bearing - Delrin balls Sheave material - Resin Material - Stainless Steel Weight 0.16 lb 73 g