Carbo fiddle block 40mm with becket and cam 40mm. For 1/4'' rope. Working load: 485 lb. Sheave: Long-glass reinforced engineered nylon. Ball bearings: Engineered plastic in fitted ball races. Sheave size: 1 9/16'' (40mm). Line diameter: 3/8'' max. Cheek material finish: Long-glass reinforced engineered nylon. Shackle/strap: Stainless swivel shackle.