Metabo 6.24066 comes ready-punched. The 6-Inch cling-fit sanding disc assortment is for aluminum oxide. The Metabo 6.24066 fits SXE450 sander. The Metabo 6.24066 6-Inch cling-fit sanding disc assortment comes with ten (10) 6-Inch A60 cling-fit sanding discs, ten (10) 6-Inch A80 cling-fit sanding discs, and five (5) 6-Inch A120cling-fit sanding discs.