Series 25 Utility Block – 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 constructionEconomicalMaintenance freeApplications:Vang, cunningham and trapeze retriever systems on dinghiesLeech line tackles, bunk adjusters, etc on larger boatsMaterials:U.V. stabilized acetal sheavesGrade 316 Stainless Steel cheeksSpecifications: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)