As the hammer drill spins, the bit chisels away at the masonry. The mechanical process that delivers this pounding action is what separates the two tools. A hammer drill has two discs that have ...

Chisel: A hand tool that has a bevelled cutting edge on one end, and is used for cutting or carving. A hammer may be used in conjunction with this tool. Cobble tool: A type of large core, with a spall ...