Round Sail Track StopsRound 0.50 dia. x 0.875 (13 x 22mm)When its time to lower your sail you can rely on Davis Round Sail Track Stop to hold your sail and its slides in place on the mast and boom. Large knurled wheels are released with ease. Made of heavy-duty black anodized aluminum and marine garde nickel plated brass. Condition : This item is brand new unopened and sealed in its original factory box.