The listings commonly show a 7/8-inch arbor and label discs as Type 29 or Type #27.
Flap discs are listed with maximum operating speeds around 13,000 RPM, with one listing specifying 13,300 RPM as the maximum.
They’re described for wood and metal sanding and finishing, paint preparation and rust removal, welded-seam grinding and trim work, polishing and deburring, and work on stone and concrete.
Oscillating triangle sanding pads use a hook-and-loop (Velcro) backing so sandpaper sheets attach and change quickly; some pads are sold with sheets separately or as part of a kit.
Some triangle pads advertise a universal-fit connector for most oscillating tools. Flap discs list 4.5-inch diameter and a 7/8-inch arbor, noting compatibility with 4.5- and 5-inch angle grinders.
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