Review on Efficient And Precise: Mgtgbao 8PCS Green Diamond Drill Bits Set For Granite, Marble, Tile, And Glass by Jose Mcdaniel

I got these to install a new Over the Range microwave on a wall with Glass Subway Tile backsplash. These worked nicely for predrilling the holes in the tile where the mounting frame with be lag bolted.I used a spare tile to practice making holes before I started on the wall where mistakes aren't undone so easily. My Tip (note I said MY tip not PRO tip, because I definitely AM NOT a Pro) - Start drilling by turn the drill on LOW SPEED making sure the bit IS NOT in contact with the surface. Cant the Drill at a 30-45 degree angle so the edge where the flat top and curved side meet is FIRST TO CONTACT the surface where you want the hole. Slowly rock the drill, holding tightly, to the vertical position and drill down slowly. By putting it on an angle first, it seems to lessen the "runaway" effect and starts a clean cut. Worked better for me anyway, on the slick smooth glass surface of the tile.