【Excellent quality】This square drill is made of high-speed steel, sturdy and practical, high efficiency. Heat-treated cutting edge, high hardness, continuous blade, fast cutting. 【High-quality design】The design of the drill guide of the cutter provides effective protection against tearing at the beginning of use. No offset, the saw blade is automatically discharged from the top of the hole on both sides, the drill bit is not blocked. 【Labor-saving and accurate】Reduce the labor intensity of construction workers, speed up the construction speed, reduce construction costs for construction, installation, renovation, decoration. 【Wide range of uses】Ideal for drilling square holes in wood with a mortising machine or mortising attachment. Square hole drill bits are mainly used for woodworking. This drill can not be used for electric drill or bench drill 【Wide Application】This square hole drill bit is suitable for wood, including MDF, plastic, particle board, channel wood, pine wood,