Drilling units, grinding units, milling units and lapping units are tools used in metalworking to perform precise and efficient machining operations. A drilling unit is a device used to drill holes in workpieces. It may be equipped with a drill spindle and a drill chuck to accommodate drill bits of different sizes. Drilling units may also be equipped with an indexing system to allow precise positioning of the workpiece. A grinding unit is a device used for grinding workpieces. It may be equipped with grinding wheels or other abrasive tools to perform various surface finishing operations. Grinding units may also be equipped with an indexing system to enable precise positioning of the workpiece. A milling unit is a device used for milling workpieces. It can be equipped with milling heads or other milling tools to create complex shapes and contours. Milling units may also be equipped with an indexing system to allow precise positioning of the workpiece. A lapping unit is a device used to sharpen tools such as drills, milling cutters and cutting tools. It may be equipped with grinding stones or other sharpening tools to precisely finish the edges and surfaces of the tools. All of these units are useful tools to increase work accuracy and efficiency in metalworking. The choice of the right tool depends on the specific requirements and the workpieces to be machined.