Ronstan Series 40 Blocks are all purpose blocks designed to cover a
range of scenarios. 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 required