Ridgid R5011 Drill, 1/2-Inch 2-Speed Hammer Drill Durable 8.5 Amp motor with hardened steel gears  built to exacting specifications for extended tool longevity Automatic clutch  reduces stress load on motor and gearing Dual speed/torque gearbox  allows the user to set the drilling speed to match the application. Use 1st gear for high torque and 2nd gear for max drilling speed Ergonomic two finger trigger  features full range speed control and molded soft grip design Heavy duty keyed chuck  all metal design for positive bit retention and added durability