3M RANDOM ORBITAL NON-VACUUM SANDER - Non-vaccuum sanders. Sanders are available in 3", 5" and 6". MOS: 12,000 RPM. Non Vacuum sanders come with a 3M Stikit Disc Pad for use with Stikit abrasive discs. 3" sanders have a 3/32" orbit, 5" sanders have either a 3/32" or 3/16" and the 6" is 3/16" orbit. The larger the orbit, the more aggressive the sander. Product is sold by the each.