EDiamondTools 4.5 in. Crack Chaser Blade for Concrete and Asphalt Repair - 1/4 in. Crack Width - 7/8 in.-5/8 in. Non-Threaded Arbor CCS4525A7 - The Home Depot
3" Crack Chaser Blade for Cured Concrete, Asphalt Repair or Joint Widen, Continuous Rim, 0.410" Width, 5/8"-11 Arbor - Amazon.com
Amazon.com: PROLINEMAX 4" Crack Chaser Diamond Blade V Shaped Segment 0.375 7/8''-5/8" 12mm Rim Concrete Grinder : Tools & Home Improvement