Ronstan Series 50 All Purpose Block - Double MELVHFA3 The dual pivot point design

The dual pivot point design allows for infinite adjustability - forward

high and low

The 70mm sheave Size 7 high load cruising block range is engineered for superior strength and performance and offers both plain and ball-bearing sheave assemblies

One-Piece Molded Sight Glass Eliminates Tie Rods and Gaskets

Ronstan Series 50 All Purpose Block - Double MELVHFA3 The dual pivot point designSeries 50 All Purpose Block Double 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. Swivel shackle head for full 360 degree rotation (non locking).