All 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
Sheave 50 mm