Series 50 All Purpose Block - FiddleFeatures:Exceptionally high working loadsLow maintenance, long service lifeSelf-lubricating Acetal polymer sheave ensures low friction and extreme durabilityCaptive Lock™ universal headSlotted pin shackle eliminates fouled linesAll 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™ universal head can be fixed in either of two planes, or free to swivel as requiredApplications:Mainsheet and halyard applications, vang and spinnaker control lines on boats to 10m (33ft)S60 - on boats up to 12m (40ft)Ideal for fine-tune mainsheet tackles, cunninghams, backstays and other control line purchase systems.Materials:Grade 316 stainless steel load strapImpact and UV resistant, fiber reinforced Nylon cheeks