€¢ Polished-lacquer; solid-brass construction for durability and rust resistance €¢ Replaceable; hardened steel tip for long life €¢ Screw top simplifies attaching string to center of plumb €¢ Thru hole ensures easy tightening >> Brass plumb bob ideal for use in framing; deck building; plumbing; transit location and construction applications. Screw top simplifies attachment of string to center of the plumb. Polished-lacquer solid brass construction resists rust; thru-hole ensures easy tightening. Replaceable; hardened steel tip provides longer life; extra tip included. Weight: 8 ounces."