http://tinyurl.com/kydbzz5
Stanley 47-973 8-Ounce Brass Plumb Bob
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