Series 50 All Purpose Block - Double - BecketFeatures:Exceptionally high working loadsLow maintenance, long service lifeSelf-lubricating Acetal polymer sheave ensures low friction and extreme durabilitySlotted pin shackle eliminates fouled linesLockable swiveling head postSnap fit removable becket pinSpare parts - RF51010 Replacement Becket Pin, RF151 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.Head can be locked at 0° or 90° by engaging the grub screw in either the 0 or 90 degree position. Becket pin is removable so line can be spliced prior to fitting and is ingeniously locked into position without the use of a clevis pin, split ring or toolApplications:Mainsheet and halyard applications, vang and spinnaker control lines on boats to 10m (33ft)S60 - on boats up to 12m (40ft)Materials:Grade 316 stainless steel load strapImpact and UV resistant, fiber reinforced Nylon cheeks