Series 50 All Purpose Block - Fiddle - Becket - CleatFeaturesExceptionally high working loadsLow maintenance, long service lifeSelf-lubricating Acetal polymer sheave ensures low friction and extreme durabilityCaptive Lock™ universal headSlotted pin shackle eliminates fouled linesSnap fit removable becket pinMulti-position cleat armSpare Parts - RF51010 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.Captive Lock™ universal head can be fixed in either of two planes, or free to swivel as required. Quick adjusting cleat arms require no tools to adjust and fix securely in position. Becket pin is removable so line can be spliced prior to fitting and is iAppllications: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