Fiddle block with stainless steel cheeks. Works with 505-75 or 505-76 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 6 7/16" (163mm), SWL 1750 lbs. (795kg), Weight 11.3oz (320g), Max Line 7/16" (11mm)