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Technical data Max. impact energy 2 J. Max. number of impacts at nominal speed 0 – 5,100 rpm. Nominal rotation speed 0 – 1,800 rpm. Battery voltage 18 V. Weight without battery 2.4 kg. Tool holder SDS plus. Drilling range. Drilling Ø in concrete with rotary hammer bits 4 - 21 mm. Optimum area of application in concrete with rotary hammer bits 6 - 10 mm. Max. drilling diameter in metal 13 mm. Max. drilling Ø in wood 30 mm. Total vibration level (hammer drilling in concrete). Vibration value generated ah 10 m/s². Tolerance K 1.5 m/s². Noise/vibration information. Sound pressure level 90 dB(A). Sound power level 101 dB(A). K tolerance 3 dB. GBH 18V-21 Professional Highlights The GBH 18V-21 Professional cordless hammer drill delivers long-lasting performance with 2.0 J impact energy and a brushless motor. The highly efficient brushless motor reduces maintenance and improves runtime per battery charge, resulting in less downtime and longer tool life. Features three-mode operation for hammer drilling, drilling and chiselling for high versatility. Long-lasting performance for drilling many holes and 20% longer battery life than its predecessor. Fully compatible with the GDE 16 plus dust extractor. The GBH 18V-21 Professional features LED light, rotation control, variable speed and Vario Lock.