This all-purpose block is a great all around solution. A self-lubricating Acetal polymer sheave ensures low friction and is extremely durable. This block is the right choice for sheets, halyards and control line applications for cruising and racing. The Captive Lock™ universal head can be fixed in either of two planes, or free to swivel as required. It's becket pin is removable so line can be spliced prior to fitting and locks into position without the use of a clevis pin, split ring or tools.