Lewmar 50mm Single Synchro Block Ronstan Series 15 B - 12 1/4" (310mm)

B - 12 1/4" (310mm)

The main fabric is lightweight and extremely comfortable while the design is simple yet functional just like the rest of the Manchester Concept

Ronstan Series 26 Stand-Up Spring

Pre-drilled for fasteners

C- 15/64 inch

Lewmar 50mm Single Synchro Block Ronstan Series 15 B - 12 1/4" (310mm)Product Description Lewmar 50mm Single Synchro Block Lewmar's Synchro Blocks are engineered for speed, efficiency and superior handling. We use a combination of scientifically optimized block geometry, a Free Spin bearing and self aligning head to reduce friction and increase efficiency by up to 40%, over budget blocks on mainsheet systems. Each component is perfectly synchronized with the movement of the rope, providing you with an easier, smoother