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.