Machine vises mount to worktables to position and hold workpieces during machining operations. Sometimes called workholding vises, they have a wide base that provides a stable mount and wide jaws that provide a large surface area for clamping workpieces. Adjustable jaws can be opened and closed to accommodate different sizes and increase and decrease the clamping force. The jaw height, width, and opening size will determine the size of the workpieces that can be held in the vise. Drill press vises have slots to attach to and align on a drill press table. Milling machine vises position and hold parts and workpieces during machining applications. Precision toolmaker vises hold smaller workpieces securely to provide high precision milling, grinding, and drilling.