Diablo, 412, XLock, Diamond Continuous, Masonry, Cut Off Disc, Diamond Continuous Rim Masonry Cut Off Discs Provide Extreme Durability, Minimal Downtime Increased Productivity, 4X Longer Cutting Life Versus A Standard Diamond Cut Off Disc, Industrial Grade Diamonds With Hardened Disc Body Delivers Lasting Durability Maximizes Cutting Quality In Hardened Materials Even In Extreme Applications, Designed To Be Backwards Compatible, These Discs Work With XLock Angle Grinders 78 Arbor Angle Grinders