【3800W COPPER MOTOR & 6-SPEED CONTROL】4‑head concrete grinder features an industrial-grade 3800W copper motor with 6-speed knob control (0-4800RPM). It enables precise adjustment for tasks ranging from marble polishing and epoxy floor to heavy concrete grinding, serving as a powerful electric concrete floor grinder for professional and DIY use 【QUADRUPLE EFFICIENT GRINDING】Diamond grinding machine is equipped with four 4-inch diamond grinding heads and rotational deviation compensation, ensuring stable, smooth grinding. Powered by a robust copper motor, it boosts work efficiency by 400% compared to single-head grinders, making it for large-area floor processing 【TWO COMPREHENSIVE KIT OPTIONS】Electric concrete floor grinder offers two kits: Kit 1 includes the grinder, tools, various discs, and a 180cm 4-section extension pole (minimum physical strain); Kit 2 adds a dust collection kit to gather debris. The extension pole facilitates high-area work, while the dust kit keeps the workspace clean 【ERGONOMIC DESIGN】Handheld concrete polisher adopts ergonomic auxiliary wheels and handles, allowing easy movement, relieving work fatigue, and enhancing stability. Its user-friendly design ensures comfortable, safe manipulate for DIY homeowners, floor contractors, and construction workers during extended use 【DUAL PORT Dustproof SYSTEM & WIDE USE】Garage floor polisher has a detachable dust hood (fits 90° against walls, reaches corners) and dual-channel dust outlets compatible with industrial vacuums. It’s widely used for garage floors, basement concrete polishing, warehouse epoxy preparation, home floor leveling, and outdoor patio cleaning