To be used with disc sanders3M® precision-shaped ceramic grain delivers sharp, cool and consistent cutting actionEvenly-spaced grain features gaps that help debris escape, bolstering 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 edgework3M® Roloc™ attachment makes disc to tool attachment swift and easy