Our 4" Diamond Ultra Dry Core Bits are engineered with thin kerf segments to provide you with the fastest drilling and longest life in concrete, brick, and block applications. These diamond core drill bits deliver up to 20% longer run-time vs our previous generation of dry core bits. MILWAUKEE® dry core bits are specifically designed for use with our MX FUEL™ Core Drill and corded core drills for maximum versatility. Our Ultra Dry Core Bits feature a 13" drilling depth and 1-1/4"-7 thread connection for easy no-adapter use in our MX FUEL™ Core Drill. Our concrete core drill bit sizes range from 1-¼” to 6” to meet all your core drilling jobs.