Abstract: A sanding disk for a rotary sander includes an edge which has a plurality of spaced projectionsp. These radially extended projections, preferably in the form of a wave form, facilitate sanding interior radiused surfaces. This sanding disk can be used on a unique pad having an arcuate outer radial edge which further facilitates sanding interior radiused surfaces. The sanding disk may also have a plurality of arcuate slots which are adapted to align with radial holes in the pad of the rotary sander. The radial holes generally communicate a vacuum source.