Series 50 All Purpose Block - Single - Universal 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. Captive Lock(TM) universal head can be fixed in either of two planes, or free to swivel as requiredFeatures:Exceptionally high working loadsLow maintenance, long service lifeSelf lubricating sheaveCaptive Lock(TM) universal headSlotted pin shackle eliminates fouled linesApplications:Mainsheet and halyard applications, vang and spinnaker control lines on boats to 10M(33')Materials:NylatronA(R) sheaveGrade 316 stainless steel load strap and head fittingImpact and U.V. resistant, fiber reinforced Nylon cheeksSpecifications:Sheave : 50mm(2)Max. Rope : 12mm(1/2)Max. Pin : 5mm(3/16)M.W.L.: 750kg(1,650lbs)B. L.: 1,500kg(3,310lbs)Weight: 118g(4.1oz)