Single Lead Block – 19mm(3/4″) Sheave DiameterLead blocks are a low profile solution for leading halyards or other rig sail controls back to cleats or jammers.Applications:Typically used in dinghy spars for control linesMaterials:U.V. stabilized Acetal sheaveGrade 316 stainless steel load housingSheave :19mm(3/4″)Max. Rope :8mm(5/16″)Fastener :5.0mm(3/16″)M.W.L.:250kg(550lbs)B. L.:550kg(1,100lbs)Weight:20g(0.7oz)