7/8" Inch 22.4 mm DiamondSure Diamond Drill Bit Hole Saw for Glass, Tile, Granite, Ceramic, Porcelain, Stone - Amazon.com
1/4" Inch 6.5 mm DiamondSure Diamond Drill Bit Hole Saw for Glass, Tile, Granite, Ceramic, Porcelain, Stone - Jobber Drill Bits - Amazon.com
3/16 in Diamond Drill Bit 3/16 inch 3 Pack for Porcelain Tile Drill Bit Glass Drill Bit Diamond Tip Bit with Core Guide to Hold in Place and Prevent Jumping 5mm Porcelain
DrillGlass 3/8" Diamond Core Drill Bits (3 Pack) 1 for Drilling Cutting Holes in Glass, Tile Ceramics, Porcelain and Stone ! Fits Your Drill or Drill Press (38DHS-3) - Amazon.com
Milwaukee 1/2 In. x 2-1/8 In. Diamond Glass & Tile Drill Bit - Gillman Home Center