Diablo 4-1/2 In. Diamond Segmented Cut Off Discs For Masonry. Diablo's Diamond Segmented Masonry Cut Off Discs Provide Extreme Durability And Longer Life In Concrete, Concrete With Rebar, Brick And Cinder Block. These Diamond Rimmed Discs Deliver Up To 2X Longer Cutting Life Versus Standard Diamond Cut Off Discs. The Disc's Industrial-Grade Diamonds With Hardened Disc Body Delivers Lasting Durability And Maximizes Cutting Quality In Hardened Materials Even In Extreme Applications.