Head swivels freely, or is easily fixed with locking feature. Injection molded Derlin sheaves contain high amounts of UV inhibiting additives to protect the plasticizers in the sheave from long term exposure to damaging UV rays of the sun. Investment cast, three-way stainless head, forged ""D"" shackles, and bolted construction for easy maintenance all score high on strength and durability. Sheave Dia. 2 3/8 Sheave Width 13/16 MLD 9/16 MWD 3/16 Pin Dia: 5/16 SWL 2.750lbs.