Are there glass cutting drill bits? | HowStuffWorks
In general, two types of drill bits can be successfully used on glass: tungsten carbide spear-tipped drill bits and diamond-tipped drill bits; there are also diamond-coated drill bits. Carbide-tipped drill bits are most commonly used for non-tempered glass, ceramics and tiles. The tip is a tiny spade-shaped point made of super-hard tungsten carbide, which is extremely durable and can withstand the friction of drilling into glass.
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