Cordless Drill Driver GSR 18V-21. The GSR 18V-21 Professional cordless drill driver is a reliable entry-level tool from Bosch's 18-volt class. Its strong torque of 55 Nm provides the necessary power for standard drilling and screwdriving applications. The dependable and durable drill driver offers professional quality for daily use, thanks to its all-metal gearbox and Electronic Cell Protection. Additionally, the professional design features a keyless 13-mm chuck for high-quality work. This power tool is designed for drilling in wood with a maximum diameter of 35 mm, in steel up to 13 mm, and for screw diameters up to 10 mm. It is compatible with all Bosch Professional 18-volt batteries and chargers. The GSR 18V-21 Professional also features 2 speed settings, auto-lock, LED light, a lithium-ion battery, and forward/reverse operation.