Lewis Boatswain's Riding Belt Model HCB-B is a derrick belt full body harness with 4 D-Rings and is part of a Personal Fall Arrest System (PFAS) and meets or exceeds ANSI/ASSE Z359.1-2007 requirements. Boatswain's is very popular for use on a drilling rig or oil platform. HCB-B is equipped with 4 D-Rings and if it is used as a fall arrest harness then it shall be used along with a shock absorbing lanyard (such as Lewis SLOWSTOP™). More Info lewismfg.com/product/boatswai...