Lewmar 60mm Synchro BlockThe Lewmar Synchro block is scientifically optimized to help increase speed, efficiency, and handling. A stainless steel strap increases the blocks strength for a longer service life. The Free-Spin bearing with the self-aligning head helps increase efficiency up to 40% by reducing friction. To help prevent line wedging the cheeks are reinforced with stiff fibre glass. Perfectly synchronized to provide a n easy smother movement of rope for less wear on your and your rope.Features: Swivel Shackle; Non-Ratcheting; Tool-free sliding swivel; Stainless steel strap; Specifications: Working load limit: 1760 lbs; Weight Limit: 4.06 oz;