Lewmar 72mm 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 an 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: 2420 lbsWeight Limit: 6.69 oz