6.4mm Woodworking Square Hole Saw Drill Bit Mortising Chisel

Description:  6.4mm Woodworking Square Hole Drill Bit Saw Square Mortising Chisel Drill Bit.     Specification:  Material:High Speed Steel;  Hardness:50-55HRC;  Square hole size:6.4mm;  Clamping shank diameter:19mm;  Drill bit shank diameter:4mm;                                   Square hole saw depth(max):45mm;  Total Length:175mm;  Fit for:Square hole machine;  Note: If you have no square hole machine, 1, You can use electric drill to drill the hole with the drill bit of the combination.  2, Use the square outer sleeve to beat the hole, and you will get a 6.4mm square hole.     Features: 1. Square hole drill can not be used on an electric drill, drill square holes need to fit a square hole drill drilling (mortise and tenon machine) to use.  2. Mortise and tenon square hole drilled by the terrible + outer sleeve in the middle of the combination.  3. Reduce labor intensity of construction workers, speed up the construction speed, reduce construction costs for construction, installation