Milwaukee® diamond wet core bits are designed to the highest standards, only using quality diamonds. Available in sizes 2 to 6 in. Milwaukee® diamond wet core bits are ideal for drilling holes in cured concrete with no reinforcement or with small diameter steel mesh and rebar. This bit is 15 in length and contains a 1-1/4-7 thread. Milwaukee® Wet Core Bit, 4-1/4 in Drill - Fraction, 4.25 in Drill - Decimal Inch, 15 in Overall Length, 15 in Cutting Depth, Diamond Cutting Edge, Applicable Materials: Masonry