Series 50 All Purpose Block - DoubleAll 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. Swivel shackle head for full 360 degree rotation (non-locking).Features:Exceptionally high working loadsLow maintenance & long service lifeSelf-lubricating Acetal polymer sheave ensures low friction and extreme durabilitySlotted pin shackle eliminates fouled linesApplications:Mainsheet and halyard applications, vang and spinnaker control lines on boats to (33ft). 10mS60 - on boats up to 40ft, (12m)Materials:Grade 316 stainless steel load strapImpact and UV resistant, fiber reinforced Nylon cheeksSpecifications:Sheave Diameter: (inch) 2" / (mm) 50Max Rope Diameter: (inch) 1/2" / (mm) 12Pin Diameter: (inch) 1/4" / (mm) 6Maximum Working Load: (lb) 2200 / (kg) 1000Breaking Load: (lb) 4410 / (kg) 2000Weight: (oz) 9.0 / (g) 255