Bosch 33614 14.4 Volt Brute Tough Drill/Driver Unibody powertrain maintains alignment between clutch, gearbox, and motor for maximum durability Dura-shield housing protects tool from harsh job site conditions and impacts Two speed gearbox for high speed or high torque as needed Externally changeable brushes Ratcheting 1/2? single-sleeve chuck with carbide teeth for one handed operation