Glass drill bit

Diamond bits are what you need to drill hard, brittle materials like glass, ceramics and tile. Small holes can be made using a round ball shape glass drill bit. Holes that are 1/2" diameter and larger require a diamond core bit. Coarse Diamond bits will leave a better finish than twist drills and will not crack and chip the workpiece. Start slowly. The larger the bit, the slower you should start. The more lubrication you use, the faster you can drill. Drilling faster increases friction, burns up the bit and makes drill tips develop yellow, brown, blue or black “burn marks”.

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