VEVOR Core Drill Bit, 4.25" Wet Diamond Core Drill Bits, 14" Drilling Depth Concrete Core Drill Bit with Saw Blade, 1-1/4"-7 Inner Thread, Laser Welding, Diamond Wet Coring Bit for Concrete BrickProduct Features Precision Engineered Design Our core drill bit is designed with universal 1 1 4" 7 thread, making it easy to quickly assemble onto standard core drilling equipment, providing versatility and convenience. Dust Free Wet Cutting Our diamond core drill bit reduces dust production through water cooling and lubrication, making it crucial for indoor or enclosed workspaces, minimizing dust pollution to operators and the surrounding