SDS plus hammer drill GBH 2-21. Bosch's GBH 2-21 Professional hammer drill with SDS plus technology is the ideal compact entry-level solution for powerful hammer drilling. Its powerful 720 watt motor and 2.0 joules of impact energy ensure effective hammer drilling in concrete up to 21 mm in diameter. This compact hammer drill offers affordable Bosch professional hammer drilling performance. Versatility and convincing results are ensured by the three hammer drill settings for hammer drilling, drilling, and chiselling. This hammer drill is perfect for use on concrete, stone, and masonry. The tool is compatible with the following external dust extractors: GDE 16 plus, GDE 68, and GDE 162. It includes a workman's case, 1 x SDS plus 6 mm drill bit, 1 x SDS plus 8 mm drill bit, 1 x SDS plus 10 mm drill bit, an additional handle, a machine cloth, and a depth stop.