The Greenlee 8018 Hook-Type Sheave Unit features a strong welded steel frame with forged steel closure-type hooks (1″ opening) and an 18″ diameter aluminium-alloy sheave on self-lubricating bearings. Rated for 8,000 lb (≈ 35.6 kN) capacity. Designed for use with UT8, UT5, 6001, UT4 and UT2 cable pullers.