Milwaukee M18 2648-21 Random Orbit Sander Kit, Kit, 18 V Battery, 3 Ah, 7000 to 12,000 opm Speed | The M18 5 in random orbit sander delivers corded power with 12,000 maximum OPM output. The 7000 to12,000 variable speed dial allows the user more control over the output of the tool to match the orbit speed for the application. The tool's powerful motor allows the user to remove more material per battery charge. The M18 random orbit sander powered by REDLITHIUM battery technology delivers up to 35 mins of run-time on a M18 3 Ah battery pack.