Larouoba 10 PCS Diamond Drill bit , Ceramic Tile Drill Bit Drill Bit for hard porcelain tile, granite & marble, masonry, concrete, glass, hard plastic with size 5/16 inch 8mm (blue).

1)Cut Holes Like a Professional: The drill bit is made of cemented carbide and is manufactured by vacuum brazing diamond technology. There is special wax for lubrication in the central control tube. Wax inside the drill bit helpful for Cooling and Lubrication
2)Keep the lasting ：Wet and dry use, water can cool the drill bit and prolong the life of the drill bit.
3)Super Quality Raw Material: Using vacuum brazed technology ,which increases resistance to temperature and friction,to make the diamond particles better attach to the core steel, improve the performance and lifetime.

Specification:
Lengthen : 80mm
Color:blue
Shank：Hex Shank

10pc Larouoba Diamond Drill Bit Includes：
10 pc 5/16 inch (8mm) diamond drill bit
1pc Storage bottle

Steps To Drill Clean And Precise Holes：
1.Start Drilling the hole in an angle about 45 degrees to the surface, so the drill has the chance to start and will prevent the drill slipping.
2.Slowly move the drill bit into a more up-right position and wobble the drill bit in the circular motion.
3.Do not need to apply much pressure,let the drill bit do the work, you will feel the drill bit break through the back of the glass or tile once the hole is completed.
4.Take care when using them as a bit can glaze and burn out if use too fast.