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_________________ bits are specially used for very hard materials.

_________________ bits are specially used for very hard materials. Correct Answer diamond drill

The Diamond drill speeds vary depending upon the manufacturer and the type of diamond drill. When used properly, the Diamond drill bit should never be hot. The drill bit should never be more than warm, to the touch. If a bit becomes hot, it is an indication of inadequate lubrication, too fast a drill speed or too much pressure for the specific material being drilled.

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