ZFE 800W/110V Variable Speed 4'' Wet Polisher/Grinder & Granite Diamond Polishing Pads Concrete Polisher Stone Polisher for Granite/Marble/Concrete/Stones Safety: A GFCI for enhanced electrical safety to safeguard hazardous electrical shock. With rubber handle cover,double insulation,enhanced electrical safety. Insure a safe using experience. Variable Speed: From 500RPM to 4,000RPM, one finger can control speed switch, while polisher is in use, meet all your requirements. Comfortable To Use: All the handles (Back & Top D) are ergonomically designed for longer comfortable operations and the top D handle provided adequate pressure on the surface easily for the best polishing result. Head Heavy Polisher transfers maximum weight on polishing surface to make polishing easier better and faster Flexible Splash Guard: With unique water proof security cover, can protect you from electric shock. Can adjust to changing tools height . 3 Hole Under Water Line: Three-hole water head each at 120 degrees for even and adequate water distribution.