Main features 1.Built to API Spec 4F and 8C, have the certificate of authority to use the official API monogram. 2.Conformity with the industry standard of SY/T5527 3.Sheave grooves are quenching treated, anti-abrasion to provide extended service life 4.The rope guard prevents the wire rope from running out 5.Equipped with wooden bumper blocks and protective net. 6.Equipped with a crane frame for use of repairing the sheave groups 7.Equipped with sand line sheaves and auxiliary sheaves as requirements of customer 8.The sheaves and bearings are interchangeable with the matching traveling block