Bosch GBH 3 28 DRE SDS Plus Rotary Demolition Hammer Drill 800 W Bosch Blue Line MLA Format Guide: Steps, Examples & Templates PaperCheck PaperCheck. Top performance with 20% less vibration High drilling rate and 20% higher chiselling power than other rotary hammers in its class 20% less vibration than other hammers in its class for more comfortable working due to Bosch Vibration Control Quick change chuck for fast changes between drilling with impact in concrete and drilling without impact in wood and metal The GBH 3 28 DFR Professional is the most versatile tool in Boschs SDS plus corded rotary hammer category. Its compact housing enables multiple applications in narrow and tight workspaces. Designed for convenience, its L shaped design provides a balanced weight distribution, while its Vibration Control allows effortless continuous work. It also features a high power to weight ratio, with an 800 W motor and a tool weight of only 3. 6 kg.