they can be used for heavy loads and semi-static lines

any bicycle pump

adjustable neoprene straps

Total weight with spreader bar = 1

quick and very simple to install

Ronstan Series 50 All Purpose Block, Triple RF51300 hardware they can be used forAll 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). Exceptionally high working loads Low