PRECISION: All the bits are processed for a smooth and exact finish. This type of production leads to a consistent product where every job is done fast, efficient and correct. Will work with all electric drills.
Durable: The diamond drill bits are high quality and good performance that excellent for making clean and accurate hole. Nickel-plated with a diamond dust coating offers superior performance and cutting strength. Greatly extended service life.
Attention: Please keep the speed in 800-1000 per minute, keep adding water to keep the drill cool, strictly prohibit from dry drilling.
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