DAMO Super-flex Back Holders are more flexible than semi-rigid, used for polishing hard to get into areas and tight curves. They can be used on most popular polishers and grinders with 5/8"-11 threaded spindles. They are designed to fit diamond polishing pads of same or larger sizes. The polishing pads with velcro backing could be attached to any back holders easily and allows for a fast changing of different grit size. Available in 3", 4" and 5" size.