Gleitlager-Block mit Wirbel, Hundsfott und Schotklemme, dreischeibig

From the Seldén PBB series. It can be used as a smooth-running, cost-effective block for sheets and jibs. It's particularly suitable for halyards because the plain bearing can withstand high standing loads. The shackle can be used as a swivel or can be adjusted for length or width.