cold chisel

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A chisel made of hardened tempered steel and used for cutting cold metal.

from The Century Dictionary.

• noun A chisel with a cutting edge formed of steel properly strengthened by tempering, for cutting metal which has not been softened by heating.

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

• noun a narrow chisel, made of hardened, tempered steel, used for cutting stone etc

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun narrow chisel made of steel; used to cut stone or bricks