Cordless Hammer Drill GSB 18V-21. The GSB 18V-21 Professional cordless hammer drill is a reliable entry-level tool with a hammer drilling function from Bosch's 18-volt class. With a hard torque of 55 Nm, it delivers the necessary power for standard drilling and screwdriving applications. Its all-metal gearbox and Electronic Cell Protection ensure professional quality for daily use, making the drill both reliable and durable. Additionally, a professional design with a 13-mm keyless chuck supports 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. The hammer drilling function also allows for work in masonry up to 10 mm. Compatible with all Bosch Professional 18-volt batteries and chargers. The GSB 18V-21 Professional also features 2 gears, autolock, LED light, a lithium-ion battery, and forward/reverse operation.