Series 40 Ball Bearing Block - Single - Universal HeadSheaves running on Acetal or TorlonA(R) ball bearings provide high performance & low friction. The 2-stage ball bearing system provides consistent performance over the full load range.Captive Lock universal head can be fixed in either of two planes, or free to swivel as required.Features: Low friction Acetal or TorlonA(R) bearing system Lightweight Cheek cut-outs for easy bearing maintenance Captive Lock universal head Slotted pin shackle eliminates fouled lines Applications: Mainsheet Halyard Vang Spinnaker control lines on off-the-beach catamarans, one design classes and sportsboats up to 8M(26&';) Materials: U.V. Stabilized Acetal sheaves Acetal ball bearings Impact and U.V. resistant, fiber reinforced Nylon cheeks Grade 316 stainless steel load strap and head fitting Specifications:Sheave ;:t40mm(1-9/16")Max. Rope ;:t10mm(7/16")Pin ;: 5mm(3/16")M.W.L.:t350kg(770lbs)B. L.:t1,000kg(2,200lbs)Weight:t70g(2.5oz)