A plumb bob is an awfully handy gadget, but why get too worked up about what's basically a pointy weight on the end of a string? The answer lies in the spring-loaded reel that comes along with this rubber-bumpered, anti-wobble, swivel-equipped, over-engineered 14 oz. bob from Tajima. The 14.5' line's spring tension is calibrated to the weight of the bob, so that when you gently pull, more line comes out, and when you lift, the line retracts on its own. Not only that but the swivel mechanism in the line quickly stabilizes the bob, eliminating the annoying wait for the bob to stop moving. The reel can be fastened to just about any surface imaginable by means of a spring-loaded needle (drywall or softwood), an internal magnet (steel or wrought iron), or a retractable hook (anywhere you can drive a screw or nail). You have your choice of having the line drop from 50mm (1.9 inches) away from the mounting edge, or flush with that edge. The reel body has a thick rubber shell for protection and ease of grip.