excellent performance the hammer drill with a no-load rotation speed of 0-1000rpm, a striking frequency of 0-4500 bpm and a striking energy of 2.7j for high drilling performance. drilling capacity: 24 mm for concrete, 28 mm for wood, 13 mm for steel long service life: demolition hammer equipped with brushless motors for reduced maintenance and extended operating time. large ventilation design allows for more efficient heat dissipation and higher overload capacity, sturdy construction extends tool life. [(4 in 1 device)] the impact drill is equipped with a rotary switch that makes it easy to switch from hammer to drill, chisel and hammer drill. suitable for drilling, chiseling and stripping concrete, metal, stone and other scenes highly efficient work: sds-plus allows for quick and tool-free change of different drill bits and chisels, and compact design, small size, lightweight and easy to use, perfect for home installation and maintenance box contents: 1 x 20v cordless hammer drill, 4 x sds-plus drill bits (6 x 110 / 8 x 160 / 10 x 160 / 12 x 160 mm), 1 x 4.0ah li-ion battery, 1 x 2a charger, 1 x diy case, 1 x user manual [english language not guaranteed]