Unique plumb bobs with quick-stabilizing cap that reduces bob wobble and spin. Embedded elastomer side bumpers and thick tip guard protect bob and work surfaces. Chrome-plated to resist rust and corrosion. Snap ring for easy connect and disconnect to plumb line. Available in 21 oz., 14 oz., 10 oz, and 7 oz. weight options. Use with Plumb-Rite plumb bob setters P-700 and PZB-400.