Air-powered pistol-grip drills position the user's hand behind the bit-holding chuck to keep the tool steady and control the amount of pressure applied to the bit during drilling and driving. They provide ergonomic handling in a range of positions on vertical and horizontal surfaces. The pistol grip has a trigger that is pressed to activate the drill. These pneumatic drills operate on a compressed air supply to rotate bits in holemaking and fastening applications. Air-powered tools are typically lighter than corded or cordless tools, helping to reduce operator fatigue when used for long periods of time. They have fewer moving parts, so they tend to run cooler and have a longer lifespan than corded and cordless tools.