Here's a rewritten product description based on the provided information: Our electric concrete grinder features a triple-axis design with a single disc size of 3.94 inches, capable of covering an 8-inch diameter grinding area. This design significantly enhances grinding efficiency, saving you both time and effort. The grinder can be used to plane walls at a 90-degree angle without any issues. Equipped with a powerful 3800W motor, this concrete grinder delivers stable and robust power output. The motor is crafted from high-quality copper, which minimizes power loss during operation and extends the motor's lifespan due to its high-temperature resistance. The grinder offers six adjustable speeds, with a speed range of 800 to 2800 RPM, allowing you to replace the sandpaper disc based on the specific task at hand and select the appropriate speed for more flexible and precise grinding. A detachable protective hood is included with the concrete grinder to minimize debris splash during operation. This feature facilitates handling in various edges and corners, enabling the grinder to form a 90-degree angle with the wall. It can be used at different angles for narrow corners and can also be connected to a vacuum cleaner to effectively suppress concrete splashes. This concrete floor grinder comes with a complete set of accessories for grinding, sanding, and polishing. It is suitable for use on concrete, ceramic, tile, marble, granite, rock, and cement. Ideal for epoxy flooring, hardening flooring, cement flooring, and staircase grinding projects.