5/8"-11 ThreadMilwaukee Diamond Wet Core Bits are designed to the highest standards, only using quailty diamonds. Available in sizes 3/4" - 14", Milwaukee Diamond Premium Wet Core bits offer exceptional drilling life and speed in cured concrete with hard aggregate and medium steel reinforcement. Designed with threaded cap for easily extending the core bit. This bit is 15" in length and contains a 5/8"-11 thread.