Cordless hammer as powerful as corded now made affordable Bosch quality at an affordable price High performance: as fast as corded. Same impact energy, same drilling capacity and same speed as GBH 2-20 Interchangeable carbon brush gives high serviceability Battery and Charger not yet included. Technical data Max. impact energy 1.7 J Impact rate at rated speed 0 - 4550 bpm Rated speed 0 - 1800 rpm Battery voltage 18.0 V Drilling range Drilling dia. in concrete with hammer drill bits: 4 - 20mm Max. drilling diameter in metal: 13.0 mm Max. drilling diameter in wood: 30.0 mm