The Faithfull FAIGDSET4 is for drilling glass windows, mirrors, bottles and ceramics - for use in variable speed drills only.
These drillbits have extremely hard tungsten carbide spear tips and should be used at low speeds whilst applying light pressure only.
Note: Lubricate with water for best results
The Faithfull FAIGDSET4 is a set of 4 glass drills in a plastic case and comes in the following sizes: 3, 4, 5 and 6mm.