The GBH 2-28 has the strongest rotary hammer performance in Bosch 2 kg SDS plus category The Bosch GBH 2-28 SDS Plus Rotary Hammer is a 240V machine with a 880 Watt motor delivering up to 4000 blows per minute with an impact energy of 3.2 joules. The GBH 2-28 has enough power to drive a 68mm core cutter or 28mm hammer drill bit into concrete. Sold with a side handle and depth stop in a carry case.  Features: Delivers 3.2 J of impact energy for high-power drilling performance KickBack Control for increased user protection Vibration Control for effortless and continuous work in time-intensive applications Comes With: Auxiliary handle Depth stop 210 mm L-BOXX inlay L-BOXX 136 Machine cloth Specification: Impact energy: 3.2 J Impact rate at rated speed: 0 - 4,000 bpm Rated speed: 0 - 900 rpm Rated input power: 880 W Tool holder: SDS plus Tool dimensions (width): 379 mm Tool dimensions (length): 216 mm Drilling range: Drilling dia. concrete, hammer drill bits: 4 - 28 mm Opt. appl. range concrete, hammer drill bits: 8 - 16 mm Drilling diameter in concrete with core cutters: 16 - 68 mm Max. drilling diameter masonry, core cutters: 68 mm Max. drilling diameter in metal: 13 mm Max. drilling diameter in wood: 30 mm Weight: 2.9 kg