Excellent QualityThis square drill is made of high-speed steel, sturdy and practical, high efficiency. Heat-treated sharp cutting edge, high hardness, continuous blade, quick cuts. High Quality DesignThe design of the drill sleeve provides effective protection against tearing at the beginning of use. No shifting, the saw blade is automatically discharged from the top of the hole on both sides, the drill bit is not blocked. Labor Saving And AccurateReduces the labor intensity of construction workers, accelerates construction speed, reduces construction costs for construction, installation, renovation, decoration. Wide Range of UsesIdeal for drilling square holes in wood with a mortiser 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 ApplicationThis square hole drill bit is suitable for wood including MDF, plastic, chipboard, channel wood, pine wood, basswood, etc. Note: It is not suitable for processing metal, glass, concrete, plasterboard, etc. Scientific Match and Various Size6 pieces per pack with different slot diameter to meet your needs. Easily drill precise holes. Each drill is packaged in a single plastic case that is easy to maintain.