Abstract: A releasable hook for use primarily on the free-end of a line-tool line such as chalk lines, tape measures, and the like. The hook has an engaged position whereby it may be secured to the edge of a, workpiece, and a retracted position whereby it disengages the edge of the workpiece. The hook is biased to its retracted position. Applying tension to the line of the line-tool retains the hook on the edge. However, releasing tension on the line restores the hook to its retracted position, thereby releasing the hook from the edge without the need for the user of the line-tool to be near the hook. In a preferred embodiment, the hook includes a flat base plate and a spring hook member constructed of a strong, but resilient material. The plate and hook member are sized and positioned such that with no forces applied, the opposite end of the hook member is retracted from the base plate.