Regicocraft Hollow Square Hole Saw Mortiser Mortise Mortising Chisel Drill Wood BitUsed for drilling square holes in wood with a mortising machine or a mortising attachment 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 Material: 45# Carbon Steel Hardness: HRC 48 50 Clamping Shank Diameter: 19mm (Round) Made in Taiwan
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