$52.99 Whirlwind USA CPB 3-1/2 Inch Wet Premium Concrete Diamond Core Drill Bit for Con - Marble, Tile 
EDiamondTools 6-1/2 in. x 14 in. Wet Diamond Core Bit for Concrete and Masonry-WBP0612A4 - The 
ITW BRANDS 11256 5/32x3-1/2-Inch Concrete Drill Bit 92097112568 | eBay
