Series 40 All Purpose Block - Triple - Swivel HeadFeatures:Exceptionally high working loadsLow maintenance, long service lifeSelf-lubricating sheaveSlotted pin shackle eliminates fouled linesTwo way head postSpare parts - RF41010 Replacement Becket Pin, RF150 ShackleAll purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel races perform equally well with dynamic loads and high static loads. For durability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.Applications:MainsheetHalyardVangSpinnaker control lines on off-the-beach catamarans, one design classes and sportsboats up to 8m (26ft)Materials:U.V. stabilised Acetal sheavesImpact and U.V. resistant, fibre reinforced Nylon cheeksGrade 316 stainless steel bearing raceGrade 316 stainless steel load strap and head fittingSheave: UV stabilised acetalCheeks: Impact modified, fiber reinforced and UV stabilized nylon