In production facilities and on job sites, hand tools and power tools are used to measure, cut, fasten, and form materials. They are also used to measure, cut, and fasten them. Among the tools used by hand are clamps, cutting tools, measuring tools, hammers, screwdrivers, and wrenches. For tasks requiring precision control, power tools are cumbersome or excessively powerful. Furthermore, power tools include drills, drivers, impact wrenches, saws, and finishing tools in addition to cordless, corded, hydraulic, and air-powered items. With these tools, tasks that require high force and speed (such as driving nails into sheetrock) are repeated. Tools for measuring and laying out workpieces are used to determine the length and angle of the pieces. With wrenches, screwdrivers, and drills, sockets and bits are used to create holes and drive fasteners. Tool tethers, balancers, and retractors ensure that tools are kept within reach as well as preventing injuries that may result from dropped tools. To make it easier to access tools, tool storage keeps them organized and protected.