【3-Head High-efficiencys Grinding】：3800W concrete grinder comes with 3 4" diamond grinding wheels which is four times the grinding efficiency of a common single-disc grinding machine. Meanwhile, we also equip you with 3 types functions of the sanding discs, including: 3 pcs diamond discs, 3 pcs polishing pads, 3 pcs sandpaper, 3 pcs adhesive discs，carbon brush Kit and professional tool kits. You can change the discs as usage scenarios 【3800W Pure Copper Motor】：This portable three-head wall and floor grinder is equipped with a 3800W pure copper motor, providing strong and stable power output, supporting long-term high-load operation. It features automatic overheat protection, automatically shutting down when the temperature exceeds a safe threshold to prevent motor damage, extend machine life, and ensures safer use. 【Six-Speed ​​Adjustment】：This concrete polishing and grinding machine offers six adjustable speeds (700-5000 RPM), allowing for flexible speed matching based on different materials such as concrete, marble, and metal, as well as tasks such as coarse grinding, fine polishing, and descaling. A complete set of accessories, including diamond grinding discs, polishing pads, sandpaper, and adhesive discs, is included, eliminating the need for additional purchases. 【90° Seamless Polishing】：The floor polisher features a detachable protective cover, easily fitting into narrow areas such as corners, stairs, and baseboards for truly seamless work. It supports external vacuum cleaners, significantly reducing dust splashes; （must be purchased separately） 【Safe and Reliable】：The electric diamond grinder is equipped with a safety lock switch and dual start-up protection. The protective cover effectively prevents debris from flying. Utilizing a high-strength aluminum alloy head, it is suitable for various projects including floor renovation, wall treatment, garages, and shopping malls.