grozing iron

from The Century Dictionary.

• noun A plumbers' tool for finishing soldered joints.
• noun An instrument with an angular projection of steel, formerly used for cutting glass.

from the GNU version of the Collaborative International Dictionary of English.

• A tool with a hardened steel point, formerly used instead of a diamond for cutting glass.
• (Plumbing) A tool for smoothing the solder joints of lead pipe.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun a plumber's tool for soldering lead pipes
• noun a tool used in making stained glass windows