Halyard stoppers are used on keel yachts for halyards, stretchers, boom downhauls, reefing lines, etc. With a halyard stopper lines can be fixed under tension. Usually the halyard stoppers are mounted on the port and starboard side of the companionway, which allows operation of most lines centrally from the cockpit (pianoThe line is fed through the halyard stopper and fixed by means of the clamping lever. With most halyard stoppers the line can be tightened without opening the clamping lever. Only to release the halyard, the clamping lever is folded up. The most common manufacturers are spinlock, easylock and lewmar.