Larger sanding area with three blades. High efficiency in sanding concrete stair surfaces, no need to press hard, easy to sand. Removable brushes, 90 degree sanding corners, leaving no dead ends. External vacuum cleaner can be connected, no dust in the work. Different discs can be replaced to meet the sanding and polishing floor work. Connect the extension pole, work without bending, sanding more flat, high surface quality. Efficient Sanding? : Variable speed angle grinder can faster material removal ideal for all types of stone like concrete, ceramic, tile, marble, granite, rock, cement, etc. 2800W Motor? : Variable speed grinder is installed with a 2800W high-power motor, which is more heat-resistant, more powerful, and has a more powerful sanding effect. Three-Gead Grinding? : Variable speed polisher machine has 3pcs grinding heads and 3pcs free diamond concrete grinding wheels, which increases the grinding area and is more wear-resistant and durable. 6-Speed Adjustment? : Electric concrete floor grinder has 6 speeds, which can be adjusted according to the unused use scenarios, making the sanding more flexible. Packing List? : 3Polishing pads, 3Sandpaper, 3Adhesive disc, 3Diamond disc.