Reversible drill for maximum performance we recommend 90 PSI air pressure. Heavy duty motor with double reduction planetary gear system to 800 RPM provides exceptional power. Reverse switch situated for fast and easy one handed operation. Side handle provides maximum operator control and absorbs stall torque reaction for operator safety. Complete with black rubber insulating grip for operator comfort and safety. Ball and needle bearing construction. Air inlet screen prevents solid matter from entering the tool, extends tool life. Standard accessory 1/2 inch keyed chuck. Optional accessory 1/2 inch keyless chuck.