The M7 SC-211C pneumatic hammer carves, drills, and chips stone, metal, and other hard materials. This air hammer features a .401 Parker shank, aka a round shank. It lets you fit any of the five chisels that come with this M7 air tool. These are flat chisel, cutting chisel, tapered punch, ripping chisel, and tailpipe cutter. These are secured with the spring retainer included in this tool kit.