Monster 4-1/2 in. Brazed Diamond Core Bit/Hole Saw for Granite, Quartzite, Marble, Concrete, Porcelain, Ceramic, Other Stones BDBP0412 - The Home Depot
Spyder Diamond Edge 2-1/2-in Diamond Non-arbored Hole Saw in the Hole Saws & Kits department at Lowes.com
Bosch 3-1/4 in. Diamond Grit Hole Saw HDG314 - The Home Depot
Drilax 2-1/2 Inch Diamond Hole Saw • Diamond Hole Saws, Diamond Drill Bits, And Tools