5 in. Gison Wet Air Polisher GPW-212Gison GPW 212 is a heavy duty wet air polisher suitable for heavy polishing of granite, marble, concrete and other types of stones. Center water feed function reduces dust, and improves environment protection. GPW 212 is designed to use 5 in. polishing discs for heavy duty polishing such as granite and concrete surface polishing and swimming pool polishing. Center water feed air polisher poses no electric hazards Maximum polishing speed is 2800 RPM