Harken 29mm Single Fixed Carbo BlockDescription - Single / fixedSheave dia. (in) - 1 1/8Length (in) - 1 15/16Weight w/shackle (oz) - 0.8Shackle pin dia. (in) -Max. line dia. (in) - 5/16Max. working load (lb) - 330Breaking load (lb) - 1000