Glass/Tile Drill Bit is made of Tungsten steel and has a carbide tip and design prevents cracking of material. 

With cross spear head, compare to normal flat spade tip it can not only drill glass tile mirror but also drill ceremic and brick which flat spade tip cannot do. 
1/4" 6.35mm quick change hex shank increase work efficiency.
Suitable for ceramic tile, vitrified brick, jade, wall, angle iron, superhard alloy, concrete, etc.
It can be installed in electric drill, bench drill, impact drill.