Designed for 3M Hookit abrasives. Improves abrasive cut and finish. Reduces vibration on dual action random orbital sanders using 3M Hookit disc pads. Get the best from your Purple + abrasive discs choose our new Hookit multihole back-up pad. Whatever your extraction system they perform. Constructed of soft durable foam these pads can be used with both dust free and non-dust free discs to improve abrasive cut and finish.