This Single Hook Tensioner for 5/16" chain will securely tension and hold the anchor in the bow roller channel. It can free up the use of the bow cleat and prepare the anchor for sea conditions assuring you peace of mind.
Note that this fitting is not designed to take the strain of the rode of a boat at anchor.
Overall length 12", the threaded hook has 1 1/2" of adjustment for ease of installation. For 5/16" chain maximum.