The Overlap Discs are 3 1/4" in diameter with 80 grit and a 4 layer design by ABRASIVE SOURCE INCORPORATED. This 12-pack of abrasive discs is perfect for sanding and finishing applications in metalworking. The slotted design allows for a secure attachment to your sander, ensuring smooth and consistent results. These high-quality discs are ideal for professionals and hobbyists alike who need a reliable abrasive solution for their projects.