This professional-grade 4-inch air-powered wet stone polisher is built for surface treatment of hard materials such as granite, marble, concrete, and ceramic tiles. It has a lightweight aluminum alloy body and an ergonomic grip, ensuring comfort even during long - hour work. The rear exhaust system optimizes airflow direction, lowering noise to below 75dB and preventing dust splashing, creating a safe workspace. With 5/8"-11, M14, and M16 connection options, it easily pairs with various grinding discs on the market, bringing great convenience for different polishing tasks.