Fiddle block with becket and anodized aluminum cheeks. Works with 504-45 for a 4:1 purchase. Delrin(tm) sheaves ensure smooth operation and high safe working load.Sheave Dia. 2" (51mm), Thickness 15/16" (24mm), Width 2 3/8" (60mm), Length 7 3/16" (183mm), SWL 1750 lbs. (795kg), Weight 8oz (227g), Max Line 7/16" (11mm)