Ideal For Small Self Anchoring Concrete Screws. Hammer & Rotation / Rotation Only. Variable Speed, Reversible. Industrial aluminum gear housing for durability and long tool life. Lock on button for easy comfortable operation during prolonged periods of use. 1/2 inch keyed chuck will accept 5/8" concrete bits with 1/2 inch reduced shank. 360° swivel side handle. Ergonomic soft rubber grip design for vibration absorption and comfortable operation.