Stanley 47-973 8-Ounce Brass Plumb Bob Stanley - Black & Decker 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; backed by lifetime limited warranty 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; backed by lifetime limited warranty