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Features:1.Professional wood drill bit, suitable for construction, installation, renovation, decoration industry, etc.2.The utility model in the hole drilled by the rotary body, while the impact of the use of hammer impact force transmitted to the outer,body the material crushing round hole and square head wall, a one-time processing of a square hole, and the dust can be broken slag discharged from the tube.3.The dimension refers to the length of the square hole drilled by the square hole.4.The cylinder diameter of the clamped portion is 19mm/0.74inch.5.The square hole drilling core we sell are more than 210mm, belong to longer drilling core.pack of 4pcs