Holder enables use of 5" 3M Hookit D/F discs (sold separately) on a larger, 6" random orbital sander * 5-hole design allows dust evacuation from the disc surface to prevent loading, increase productivity, and provide a cleaner work environment (when used with vacuum) * 3/4" medium density foam cushions a disc for optimal sanding and finishing on flat and contoured surface applications * 45 degree tapered edge offers flexibility and enhances feather-edging and blending * Hookit system provides easy disc changes and optimizes disc life