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Selden PBB (Plain Bearing Block) 80mm range features a fiberglass-reinforced sheave with a polymer bushing, a stainless steel strap, for strength and durability. It also has bronze top swivel bushings and an 8mm shackle with a 10mm pin for a strong and lightweight combination.
The 80mm PBB range is designed for heavy and static load applications in halyard tuning, mainsheet systems, and boom vangs on offshore boats.