allows either a 2:1 or 3:1 purchase.Great for mainsheet or spinnaker blocks and control lines on offshore yachts. Robust construction handles high loads offshore. Ball-bearing sheaves minimize friction. Beefier posts and wrap-around straps create much higher working loads. Three-way head system permits blocks to swivel or be fixed side-to-side or fore-and-aft. Beckets are removable. Where applicable, blocks use 1/4" fasteners.Key FeaturesGreat for mainsheet or spinnaker; control lines on offshore yachtsTough construction handles high loadsHigh-load Torlon ball-bearing sheaves minimize friction3-way head system for swivel or fixed mountingWrap-around stainless straps; stainless-steel shackleSheave Diameter: 3" (76 mm)Max. Line Diameter: 9/16" (14 mm)Max. Working Load (MWL): 2800 lb. (1270 kg)Breaking Load: 7000 lb. (3175 kg) Weight: 26.5 oz (751 g)Length: 8 1/2" (216 mm)