Bosch GBH 3-28 DFR 3kg SDS+ Rotary Hammer Drill with Quick Change Chuck FEATURES High drilling rate and 20% higher chiselling power than other rotary hammers in its class Low vibration (only 12 m/s²) for more comfortable working due to Bosch Vibration Control Quick-change chuck for fast changes between drilling with impact in concrete and drilling without impact in wood and metal Balanced weight distribution due to L-shaped design for more comfortable working Rotation stop for chiselling Ball grommet for preventing cable breaks Rotating brush plate for equal power in forward and reverse rotation Impact stop for drilling in wood and metal VIBRATION CONTROL At the place of origin: the impact mechanism - A longer air cushion leads to lower pressures and thus lower vibrations (comparable to a longer spring) without reducing performance At the place of its effect: the handle - The external shock absorbers further reduce the vibrations. The flat springs separate the handle from the machine SPECIFICATION Rated power input: 800 W Max. impact energy: 3.1 J Impact rate at rated speed: 0 - 4.000 bpm Rated speed: 0 - 900 rpm Weight: 3.6 kg Length: 354mm Height: 233mm Toolholder: SDS-plus Drilling diameter in concrete with hammer drill bits: 4-28mm Optimum range in concrete with hammer bits: 12-18mm Max. drilling diameter in masonry with core cutters: 82mm Max. drilling diameter in steel: 13mm Max. drilling diameter in wood: 30mm Vibration level (drilling): 12.0 m/s² Vibration level (chiselling): 11.0 m/s² Vibration level (drilling/chiselling): 12.0/11.0 m/s² Vibration level (drilling): 12.0 m/s² Vibration level (chiselling): 11.0 m/s² Vibration level (drilling/chiselling): 12.0/11.0 m/s²