Neiko 30083A 1/2" Reversible Pneumatic Air Drill, 500 RPM, Durable ball bearing construction is solid and improves balance, reduces vibration and ensures a long service life Built-in noise control mufflers in rear handle exhaust is connected to air compressors producing low noise output limiting distraction for better concentration Ergonomic designed pistol grip reduces effects of chill and vibration with a side handle for exceptional control and maximum comfort Comfortable one finger touch side-mounted forward/reverse switch makes directional changes smooth and easy Lightweight, composite housing design is easy to hold and withstands heavy duty action with speed up to 500 RPM at 4 CFM air consumption