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Description: - Professional woodworking drill bit, square hole saw cutter - High speed steel material, high hardness, lengthened core - Matched use with mortise and tenon machine - The square hole punching needs to use electric drill, hammer and other tools - For construction, installation, renovation, decoration, etc.Specification: - Material: High Speed Steel - Hardness: HRC48-50 - Clamping shank diameter (cylinder): Approx. 19mm/ 0.75 inch - Drilled core length: Approx. 210mm/ 8.27 inch - Center drill bit diameter (the square hole side length): - Approx. 12.7mm (1/2") - Approx. 9.5mm (3/8") - Approx. 7.94mm (5/16") - Approx. 6.35mm (1/4") - (as you choose)Package Includes:1 Piece of Square Hole Saw with Drilled CoreChoose all you need in our store. You will have a nice purchase experience and get quality products and service corresponding to the policy of Amazon.