NT self adhesive Sanding Plate is credit card size, 80 x 54 mm. This stainless steel abrasive plate is almost as thin as paper, only 0.2mm. It is fine grade, approximately equivalent to 400 grit. However, the cutting action makes it feel coarser, but with a smooth finish. The package includes a piece of double-sided tape, used to mount the plate to a homemade sanding block, flat or curved. The plate cuts easily with scissors so you can make sanding blocks for specific tasks.