C. Sherman Johnson Anchor Chain Tensioner for 3/8" Chain Single-Hook. They will free up use of the bow cleat and prepare the anchor for sea condition assuring you peace of mind. This fitting is not designed to take the strain of the rode of a boat at anchor. "Single Hook" style has overall length of 12" the threaded hook has 1-1/2" of adjustment for ease of installation. Specifications for C. Sherman Johnson Single-Hook Anchor Chain Tensioner for 3/8in Chain: Manufacturer: C. Sherman Johnson Color: Silver Package Contents: C. Sherman Johnson Single-Hook Anchor Chain Tensioner for 3/8in Chain C. Sherman Johnson 46-250-2: Anchor Chain Tensioner for 3/8" Chain Single-Hook