Features:-It will get double effect by matched use with mortise and tenon machine.-The square hole punching needs to use electric drill, hammer and other tools.-Reduce labor intensity of construction workers, speed up the construction speed, reduce construction costs for construction, installation, renovation, decoration industries.-The square chisel mortiser combines the cutting of a four-sided chisel with the action of a drill bit in the center.-The bit clears out most of the material needs to be removed and the chisel ensures the edges are straight and clean.-Great for drilling square holes in wood with a mortising machine or a mortising attachment.-Fits all mortising machines and drill press attachments.-Square hole drill is mainly used for woodworking aspects.Specifications:Product Name: Square Chisel MortiserMaterial: Carbon SteelChisel Side Width: 10mm / 0.39 inchChisel Drilling Depth: 53mm / 2.1 inchShank Diameter: 7mm / 0.28 inchHolder Diameter: 19mm / 0.7 inchTotal Length: 208mm / 8.2 inchesPackage Contents: 1 x Chisel Drill Bit1 x Plastic CaseHow to Use:A. Mark the position of the hole and use the hole drill to make a hole.B. After removing the core, use a square hole jacket to align the position of the hole.C. the square hole continuously and slowly and you can get the square hole.NOTE: 1.Installed in the square hole machine directly, supporting the use, you can drill a square hole (especially recommended).2.If bench drills or electric drills are used, they must be strictly executed according to the operation method. Otherwise they can only be processed into round holes and cannot be processed into square holes.