Refer to this chart for specifications on sheave sizes for these products: 10,000 lb. Hooked Hanger Sheave, 4,000 lb. Hooked Hanger Sheave, Cable Feeding Sheave, Corner Cable Guide, Heavy Duty Quadrant Block, Fiber Optic Quad Block, Fiber Optic Hanger Block, 3 Sheave Cable Guide, Fiber Optic Sheave Mount, Overhead and Underground Fiber Optic Cable Sheave and Jamb Skid.