A compact, lightweight detail sander that's easy to maneuver with one hand—5/64'' sanding stroke offers an exceptionally fine finish.
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A compact, lightweight detail sander that's easy to wield with one hand, the Festool RTS 400 REQ makes easy work of flat, vertical and overhead surfaces. Weighing in at only 2.4 lbs, it's also highly maneuverable, a key benefit when balancing on edges and following curves. Thanks to the delta-shaped pad, dipping into tight corners is easy. Additional features include stepless variable speed, and vibration-stop balancing for reduced fatigue during prolonged use. The RTS 400 comes equipped with a 100mm x 150mm triangular pad (approximately 4'' x 6'' overall).
Features:
WARNING: The product can expose you to chemicals including Di (2-ethylhexyl)phthalate (DEHP), which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov. WARNING: Some dust created by power sawing, sanding, grinding drilling or other machining contains chemicals such as lead from lead-based paint, wood dust, crystalline silics from bricks and cement and other masonry products, arsenic and chromium from chemically treated lumber which are known to the State of California to cause cancer and birth defects or other reproductive harm. Avoid inhaling dusts or use a dust mask or other safeguards for personal protection. For more information go to www.P65Warnings.ca.gov. 
Goes with the pads I just bought
Love my other Festool sander but have a project where I need to get into corners.
Excellent reviews.
My wife really likes these sanders
Is a finish nice sander