Scholl Concepts iQ-PUCK 2-in-1 Hand Applicator is a handy and intelligent two-in-one tool for manual use of sanding discs, polishing pads or felt pads. The small (size 76-85mm) Velcro-receptive, ergonomic hand applicator can be enlarged with the accompanying, compatible, medium-sized (125-145mm) backing plate. The firm Velcro layer between the discs allows for easy changing in seconds.