3M Elite Non-Vacuum Random Orbital Sanders optimize sanding and surface preparation on many surfaces, including wood, metal prep for paint, fiberglass and composite materials, and many other substrates. Also known as dual action (D/A) sanders, these industrial-grade tools rotate the abrasive disc and disc pad in two simultaneous overlapping oval patterns so no single abrasive particle follows the same path twice, resulting in a swirl-free finish, even when sanding against the grain.
Pneumatic sanders are also called air sanders and run on power generated by an air compressor. Non-vacuum models such as these are not connected to a vacuum system and are used in applications where dust extraction is not a concern.