Reversible drill for maximum performance we recommend 90 PSI air pressure. Designed for heavy duty use this powerful yet compact air drill features a heat treated cylinder, two steel motor bearing plates, black oxide finished rotor and full cage planetary gear mechanism for maximum service life. Reverse switch situated for fast and easy single handed operation. Complete with black rubber insulating grip for operator comfort and safety. Pressure grease fitting on housing permits easy maintenance for longer tool life. Air inlet screen prevents solid matter from entering the tool for extended tool life. Excellent for a wide range of drilling jobs. Standard accessory 3/8 inch keyed chuck. Optional accessory 3/8 inch keyless chuck.