5/16 Diamond Drill Bit 5/16 in 3 Pack for Porcelain Tile Drill Bit Glass Drill Bit Diamond Tip Bit with Core Guide to Hold in Place and Prevent Jumping 8mm Porcelain Drill
5/16" Porcelain & Hard Tile Bit with 5/32" Starter Drill Bit - Greschlers Hardware
Drill America 10-Piece 5/16-in 2-1/2-in Carbide Tipped Right Handed Glass and Tile Drill Bit at Lowes.com
5/16" Carbide Tipped Type 626 Drill Bit with Spear Point for Glass & Tile, Norseman Drill #NDT-56550 | AFT Fasteners
Rubi 5/16 in. Wet Cut Drill Bit 4923 - The Home Depot