3M DBI-SALA Advanced 8516190 Confined Space System, Floor Mount Sleeve Davit Base, Zinc Plated, for Advanced Offset Davit Mast, Yellow Zinc Eliminates metal to metal contact improving performance and ensuring smooth consistant davit mast rotation Designed to allow installed davit mast to rotate freely for maximum flexibility and freedom of movement Mounts to horizontal concrete or steel structures providing anchor point base for offset davit mast Attaches to horizontal surfaces where frequent confined space system set-up is required providing a permanently installed davit mast base to an existing structure Floor mount sleeve davit base, zinc plated, for Advanced offset davit mast