a hardened steel tool (often made of a scrap of steel) with a 1/2-inch to 3/4-inch straight cutting edge. Because saws were not readily available until the 1900's all cutting on early work was done with a chisel
Available in a variety of specialty configurations, cold chisels are heavy steel chisels with integral hexagonal-shaped handles. When struck with a baby sledgehammer, they make short work of cutting and forming metal, bricks, tile, concrete, cinder blocks, and stone. Home Improvement Encyclopedia
The cold chisel is a heavy steel tool with an integral handle for striking with a hammer to shear sheet metal or chip away at heavier bar or rounded materials. The cold chisel can be used to cut bolts, rivets, and alloy steel shafting and to remove the heads from nails, screws, and bolts to make surfaces level.
A metal cutting chisel, which incorporates a striking surface and handle with the shank of the chisel. The length of the chisel is wedge shaped for about a third of the way, tapering down to a hardened cutting edge. Hammers are used to strike a cold chisel.