Series 25 Utility Block(TM) - Single - Swivel Shackle HeadStainless steel cheeks and Acetal sheaves ensure a long service life with virtually no maintenance. Hollow rivets in the block heads can be fitted with shackles, which can also be used to add a becket for extra purchase. Features: Lightweight durable construction Economical Maintenance free; Applications: Vang, cunningham and trapeze retriever systems on dinghies Leech line tackles, bunk adjusters, etc on larger boats; Materials: U.V. stabilized acetal sheaves Grade 316 Stainless Steel cheeks; Specifications:Sheave : 25mm(1")Max. Rope : 6mm(1/4")Pin : 4mm(5/32")M.W.L.: 150kg(330lbs)B. L.: 300kg(660lbs)Weight: 20g(0.7oz) - cis2:mm5mnJlm -