Ready to Run 3M™ Orbital and Random Orbital Sanders (sold separately) combine durable, lightweight construction and operator ergonomics around a powerful precision-balanced motor for professional performance and a swirl-free finish. When it comes time for motor replacement, 3M™ offers Orbital and Random Orbital Sander Drop In Motors to expedite the process. Having a motor pre-assembled and ready to go helps end users repair their 3M™ Orbital and Random Orbital Sanders quickly, without the time or additional equipment needed to properly rebuild a worn out motor.