Highest Torque available powers through the toughest applications with 500 in.-lbs. of torque Two-speed gearbox: 0-450/0-1,500 RPM New features: BLUECORE¿ Battery Technology, New Hammer ON/OFF Ring (eliminates the need to change clutch setting) plus better bit retention with improved carbide-tooth chuck. Unibody powertrain maintains alignment between clutch, gearbox and motor for the most durable drivetrain system on the market Steel-reinforced collar enhances durability and protects tool when dropped on the chuck plus DuraShield¿ housing is constructed to withstand real world conditions, Manufacturer: Bosch