Can be dry and wet use,but with water is better The SABERCUT PRO 4-1/2 in crack chaser diamond blade is designed to quickly repair cracks and imperfections on various concrete surfaces Instruction: Diameter:4., 5 Inch(115mm) Segment Size: 0., 375 Inch Thickness(Width),12., 7mm Segment Height. JDK 6 Inch Diamond Saw Blade for Granite - Turbo Cutting 4.5 Inch Blade JDK 4.5 Inch Diamond Crack Chaser Blade Two Layers Tuck Point 4.5 Inch Concrete Blade Application for routing and repair random cracks in cured concrete, floor, marble, granite slabs,also can use for joint widen in masonry Diamond Blades for 4.5" (115mm) Angle Grinders Can be dry and wet use,but with water is better. Wet/Dry use:Dry and wet,use water is better., Arbor: 7/8-5/8 Arbor 4., 5 Inch Diamond Crack Chaser Blade with 7/8-5/8 Arbor, Application for routing and repair random cracks in cured concrete, floor, marble, granite slabs,also can use for joint widen in masonry.