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Brad Point starts bit drilling on center, eliminates the need for a center punch. High hardness and sharp, professional in drilling holes on wood. Suitable for drilling in soft and hardwood, plastic or acrylic. (not for metal material) High-carbon steel with quenching hardened heat treatment, very high quality and good durability. Includes various sizes and lengths in one drill bit set(3 x 60mm, 4 x 73mm, 5 x 85mm, 6 x 92mm, 7 x 100mm, 8 x 110mm, 9 x 115mm, 10 x 120mm), which meet your different needs perfectly. Note: Please allow 1-2mm differs due to manual measurement, thanks. Specification: Material:High-carbon steel Interface: standard round handle. Bit working part hardness: HRC50