8mm Diamond Drill Bit 5/16 inch for Porcelain Tile Drill Bit Glass Drill Bit Diamond Tip Bit with Core Guide to Hold in Place and Prevent Jumping Porcelain 8mm Drill Bit for Glass Ceramic Tile

Fits Regular Drill Chuck : Please Note This Type of Diamond Core Drill Bit Must Be Dipped in Water Every 10-20 Seconds to Keep Cool - if you do not dip the Diamond Core Bit You will not get dozens of holes you will only Get 1 Hole. If you do not want to use water please check our Vacuum Brazed Diamond Core Bits they can be used Dry. 5/16" Diamond Drill Bit for Ceramic Tile Porcelain Stone Glass Tile Diamond Hole Saw 8mm DIAMOND TIP DRILL BITS Cut Porcelain Granite Countertops Ceramic Glass Tile Blocks And Wine Bottles Free Diamond Core Guide included, Just Tape Guide in Place So No More Starting the Core Drill at an angle or Crossing Your Fingers Hoping that the Diamond Drill Doesn't Move While Starting The Hole - and you get the Hole Exactly Where You Want it in the Tile and not 1/2" Further Away!! Use As Granite Drill Bit With Drill Guide, With The Diamond Drill Bits Ceramic Glass Porcelain And Granite Can Be Drilled Through As Long As The Bits Are Kept Cool. Do Not Spray Water Onto Side Of Porcelain Drill Bit Set As That Only Keeps The Side Of The Glass Drilling Bits Cool, You Must Remove Glass Tile Drill Bit From Hole And Dip In Water To Cool. Remove The Material From inside The Core Drill Bits After Use or they will Build up and Block the Drill Bit and Stop it from Working.