Lewmar 50mm Synchro Block - Double

Lewmar Synchro blocks are engineered using a combination of scientifically optimized block geometry, a Free-Spin bearing, and a self-aligning head to reduce friction and increase efficiency by up to 40% over budget blocks on mainsheet systems.

• Applications:  Halyard tuning, mainsheet systems, mast foot blocks, masthead blocks, boom vang.
• Stainless steel strap for improved strength and lover service life
• Stiff glass fiber reinforced cheeks to prevent lines from wedging
• Larger sheave diameter to minimize rope friction
• Line size: 6mm  (1/4")
• Sheave diameter: 60mm
• Working load limit: 800kg 1760lb
• Double