The Greenlee 652 Hook-Type Sheave is built for heavy cable-pulling applications and features a welded steel frame with forged steel closure-type hooks (1″ opening). The 18″ outside diameter aluminum-alloy sheave is 5″ (127 mm) wide, mounted on self-lubricating bearings, with an R3.00″ groove and is rated up to 4,000 lb (≈17.8 kN) capacity.