Trizact Hookit Foam Disc 3"Our 3M Trizact Hookit Foam Abrasive Disc removes fine sand scratches on painted surfaces to reduce the amount of time spent compounding. Three dimensional mineral abrasive structures are distributed uniformly across the disc surface and wear evenly for consistent finishes, longer disc life and reduced material costs. Foam backed discs are part of the 3M Perfect It Paint Finishing System. Part of the 3M Perfect It paint finishing system for high gloss