Cordless Hammer Drill Driver GSB 12V-15. The GSB 12V-15 Professional cordless drill driver with hammer function offers a balanced ratio of power and size in Bosch's 12-volt class. With a hard torque of 30 Nm and 0-1,300 rpm, this drill driver provides an ideal combination of performance and compactness. Its compact design allows for optimal handling and is perfect for overhead work and tight spaces. Overload, overheating, and deep discharge are prevented by the drill driver’s Electronic Cell Protection. The hammer function of this power tool is designed for drilling in wood with a maximum diameter of 19 mm, in steel and masonry up to 10 mm, and for screw diameters up to 7 mm. The device is compatible with all Bosch Professional 12-volt batteries and chargers (Professional 12V System). The GSB 12V-15 Professional also features 2 gears, auto-lock, battery status indicator, Electronic Motor Protection, and lithium-ion technology. Includes 2 x GBA 12V 2.0Ah batteries; charger GAL 12V-20 Professional.