Rotary Hammer with Helical Cut, Heat Treated Gears For Heavy-Duty Industrial/Construction Applications Product Description: Rotary HammerImpact times:0-4000/minRated input power:850WNo load speed:0-900r/minMax hole-opening:Concrete:26mm,Steel:13mm,wood:30mm3 function:Drill/Hammer Drill/Hammer6/8/10mm drill bit,one flat chisel,one point chisel,one quick chuck,one auxiliary handle,one depth stop.