Fiddle block with stainless steel cheeks, becket and cam cleat. Works with 505-45 for 4:1 purchase. Delrin(tm) sheaves ensure smooth operation and high safe working load. Fast entry cam cleat allows easy line engagement. Sheave Dia. 1-7/16" (37mm), Thickness 2 5/16" (58mm), Width 3 7/32" (82mm), Length 6 13/32" (163mm), SWL 1750 lbs. (795kg), Weight 14.9oz. (422g), Max Line 7/16" (11mm)