10 x 2.1 to 3mm content: 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3mm. One of each. -Extraordinary cutting edge sharpness: due to nanotechnology and advanced grinding technology, bit more sharp cutting edge than before, can reduce the cutting force reduce the broken drill rate improve the hole wall quality.
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