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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") - (4-Piece Set)Package Includes:1 Piece of 12.7mm Square Hole Saw with Drilled Core1 Piece of 9.5mm Square Hole Saw with Drilled Core1 Piece of 7.94mm Square Hole Saw with Drilled Core1 Piece of 6.35mm Square Hole Saw with Drilled CoreYour satisfaction is our priority. So we would deliver the highest quality products and services to meet your satisfaction.