Not all power tools need electricity or use a battery. Air tools use compressed air for power, making them convenient, powerful and versatile. Air tools are especially suited for high-torque applications and repetitive grinding, sanding and assembly tasks. Attach an air hose to a compressor, then use the extra power to give you torque you need. Air compressors are also useful for cleanup or drying cars by usingcompressed air to remove dust, dirt and water.