25pcs: 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9.0, 9.5, 10, 10.5, 11, 11.5, 12, 12.5, 13mm. Blade: Three-edge cutter head design(Less than 3mm is not triple edge). Suitable for drilling of various materials such as 45# steel, die steel, I-beam, ordinary steel, angle iron, aluminum, copper, wood, etc.
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