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Product Description Find plumb quickly and easily with Johnson's plumb bobs. They feature a durable, brass-plated body with a lacquer finish to resist corrosion. The removable cap allows you to install string or line quickly and easily, while the hardened steel tip is replaceable. From the Manufacturer These plumb bobs tie easily to string and line and are great for lining up and transferring points. They are essential tools for surveyors, excavation contractors and foundation contractors. Plumb bobs can be used to plumb walls and other objects or can be attached to select Johnson tripods to center the tripod perfectly over your reference point when using lasers and optical instruments.