Pearl Abrasive P4 V450M Crack-Chaser Blade 4-1/2 x 5/8-11 For cleaning, routing, and repairing of cracks in cocrete and most other building materials Diamond matrix is designed for consisted, even wear Produces 1/2" wide 70Degree V-shaped groove Direct Sintering Technology Dry Cutting Pearl Crack Chaser Diamond Blades for Cleaning, Routing and Repairing of Cracks in Concrete and most other building materials 100% GE Diamond Matrix for superior cutting performance. Precision balanced. Diamond matrix is designed for consistent, even wear. Engineered to quickly sink into cracks and crevices.