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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: 56HRC - Clamping shank diameter (cylinder): Approx. 19mm/ 0.75 inch - Drilled core length: Approx. 200mm/ 7.87 inch - Center drill bit diameter (the square hole side length): - 10mm/ 0.39 inch, 12mm/ 0.47 inch, 2 sizes in a setPackage Includes:1 Piece 10mm Square Hole Saw with Drilled Core1 Piece 12mm Square Hole Saw with Drilled Core