What this part does: Direct replacement DC motor for WORX tools (fits WX390 and WU390). Designed to motor RS550VD H3 and compatible with WORX part number 50027484 used in drilling and fastening applications. Dropin fit without modification restores tool function quickly. Key benefits: Restores performance: Replaces a worn or failing motor to bring back original drilling and fastening power so you can finish jobs without buying a tool. Higher torque consistency: 8 precisionmachined teeth with a 7.7 mm tooth pitch deliver steady rotational force under load for more reliable operation during tough tasks. Durable construction: Silver metal housing resists wear and maintains stability over extended use, reducing the need for frequent replacements. Smooth, lowvibration running: Precision manufacturing and strict quality control minimize vibration for better handling and more comfortable extended use. Why you need it: Fixes common failure points—if your WX390 or WU390 has reduced speed, overheating, or inconsistent torque, this directfit motor addresses the problem and brings the tool back into service. Costeffective : Replacing the motor is typically faster and less expensive than replacing the whole tool. Key specifications (as provided): Replacement for motor RS550VD H3 Compatible with WORX WX390 and WU390 models Compatible with WORX part 50027484 DC motor with 8 teeth, tooth pitch 7.7 mm Metal construction, silver finish Practical applications / use scenarios: 1. Home renovation: the worn motor in your WORX drill to restore steady torque for drilling pilot holes and driving screws into studs and hardwood. 2. Furniture assembly: a fastening tool to reliable, consistent performance when assembling cabinets, shelving, or flatpack furniture where consistent screw driving is required. 3. Small workshop production: Keep a WORX tool operational for repetitive fastening and light machining tasks, reducing downtime in a hobby or small professional . Installation and performance notes: Designed for a precision, nomodification replacement of the RS550VD H3 motor in compatible WORX models. Offers consistent torque and reduced vibration when installed correctly; follow manufacturer guidance for motor replacement and safety. This motor is intended for use as a direct replacement in the stated WORX models and part numbers. Ensure compatibility with your specific tool model before .