Series 50 All PurposeBlock – TripleFeatures: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 pinAll 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.Applications: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