Lewmar 50mm 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 ShackleNon-RatchetingTool-free sliding swivelStainless steel strapSpecifications:Working load limit: 990 lbsWeight Limit: 2.5 oz