Series 30 Utility Block - Single - Ferrule Eye 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 yachtsMaterials:U.V. stabilized Acetal sheavesGrade 316 stainless steel cheeksSpecifications:Sheave :29mm(1-1/8)Max. Rope : 10mm(3/8)M.W.L.:350kg(770lbs)B. L.:500kg(1,100lbs)Weight:40g(1.4oz)