Series 40 All Purpose Block - Double Block - Full Swivel HeadAll 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. Head swivels freely.Features:Exceptionally high working loadsLow maintenance, long service lifeSelf-lubricating sheaveSlotted pin shackle eliminates fouled linesTwo way head postApplications:MainsheetHalyardVangSpinnaker control lines on off-the-beach catamarans, one design classes and sportsboats up to 8M(26')Materials:U.V. stabilized Acetal sheavesImpact and U.V. resistant, fiber reinforced Nylon cheeksGrade 316 stainless steel bearing raceGrade 316 stainless steel load strap and head fittingSpecifications:Sheave Ø: 40mm(1-9/16")Max. Rope Ø: 10mm(7/16")Pin Ø: 5mm(3/16")M.W.L.: 600kg(1,320lbs)B. L.: 1,200kg(2,650lbs)Weight: 135g(4.8oz)