Milwaukee 48-17-6014 1-1/4"-7 x 6" Core Bit Extension
Milwaukee 48-17-3100 10" Diamond Premium Wet Core Bit - Amazon.com
Milwaukee MX FUEL Li-Ion Cordless Handheld Core Drill Kit with One 3 in. Diamond Wet Core Bit and One 4 in. Diamond Wet Core Bit MXF301-2CXS-48-17-5030-48-17-5040 - The Home Depot