Concord Blades CBGD01375SP 1-3/8 Inch Laser Welded Dry/Wet Stone Drilling Diamond Core Bit 10 mm Segment Height, 3.5 mm Segment Width & 5/8"-11mm Arbor Can be used Dry/Wet Cleanly Cuts Granite, Marble, Porcelain, Artificialand Natural Stoneand More Max RPM 12,000-use wet only 3-1/4-inch tube length