Bosch GBH 2 28 DFV Professional Rotary Hammer with SDS plus (Heavy Duty) 850W Bosch HD Corded Tools Dust proof design 2: Ring Dust proof design 2: Ring SPECIFICATIONS: Continuous rating input 50W Capacity Thickness of cut : 50 mm (2″) Throat : 406 mm (16″) Length of Stroke 18 mm (11 16″) Strokes Per Minute (SPM) 400 1 1 kg Tool Dimensions (Length) 402 mm Tool Dimensions (Height) 216 mm Tool Holder SDS plus Drilling Diameter Concrete (Hammer Drill Bits) 4 – 28 mm Optimal Application Range Concrete (Hammer Drill Bits) 8 – 16 mm Drilling Diameter in Concrete with Core Cutters 68 mm Max 27% less vibration than the predecessor model due to active vibration damping