The spindle is the center of the headstock of a lathe (whether wood or metal). The spindle is the portion of rotating-cutter woodworking gear on which shaped milling cutters are attached to cut features (such as rebates, beads, and curves) into mouldings and related millwork. The cutter's angle with respect to the axis of the spindle determines how deeply the cut will go into the stock. On most lathes, the headstock spindle is mounted vertically above the tailstock. It can be moved back and forth along its axis by means of a slide mechanism. This allows the user to cut different depths into the workpiece. The headstock also contains the drive motor for the tool post. On some models, such as some band saws and drill presses, the headstock instead contains the drive unit for the tool post. The tool post houses various types of cutting tools that can be quickly changed out to produce a wide variety of results within a single job. Most often these are cylindrical cutting tools such as drills and reamers, but other shapes are available. They are held in place by clamping mechanisms that are usually operated from the headstock. Drill presses and band saws are both common tools used by carpenters and builders for fast and accurate cutting of materials such as wood, plastic, and metal.