Honeycomb type air inlet design, stable wind power, increased heat dissipation air inlet, increased internal air flow of the machine, to prevent machine burning caused by long-term operation. External carbon brush design, replacing carbon brushes without disassembling the machine, convenient and practical. Product name: Self suction concrete roughing machine Gear adjustment: 6-speed adjustment Motor power 3800W Idle speed:0-6000rpm Rated volbge:110V/220 Power cord length: 3m Grinding diss diameter:180mm Precautions 1.Due to the difference between different monitors,the picture may not reflect the actual colour of the item. 2.Please allow slight size difference due to different manual measurement.