To be used with disc sanders3M™ Precision-Shaped Grain delivers sharp, cool and consistent cutting actionEvenly-spaced grain features gaps that help debris escape, bolstering the abrasive's ability to resist loadingPoly-cotton backing offers great tensile strength, helping enhance overall abrasive durabilityHeavy X-weight backing does not wear and tear easily, rendering the disc a good match for edgeworkRoloc™ attachment makes disc to tool attachment swift and easy