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.