Big Boat 57 mm Flip Flop Block. Sheave dia.(in): 2-1/4. Width (in): 2-1/4. Length (in): 4-3/8. Height (in): 2-7/8. Max. line dia. (in): 3/8. Weight (oz): 9. SWL (lb): 2500. Breaking strength (lb): 5000.