Pneumatic drills may first be thought of for drilling holes in wood, metal, or plastic. Drills are used in a wide variety of applications. Each of these applications require the proper tool with the proper horsepower and speed to get the best results. Drilling - cutting a hole in material using a fluted bit. Reaming - opening up or sizing a previously drilled hole or aligning offset holes. Tapping - cutting threads in a drilled hole to accept threaded fasteners.