Double block with Stainless Steel cheeks. Works with 705-35 for a 4:1 purchase. Delrin(tm) sheaves enable smooth operation with high safe working loads. Swivel head may be locked in place to eliminate twists. Sheave Dia. 2 3/8″ (60mm), Thickness 2″ (51mm), Width 2 1/2″ (64mm), Length 5 27/32″ (148mm), SWL 2250 lbs. (1020kg), Weight 12.4oz (352g), Max Line 1/2″ (13mm)