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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 - Clamping shank diameter (cylinder): Approx. 19mm/ 0.75 inch - Drilled core length: Approx. 200mm/ 7.87 inch, or 210mm/ 8.27 inch - Center drill bit diameter (the square hole side length): - 6.35mm(1/4"), 7.94mm(5/16"), 8mm(0.31"), 9.5mm(3/8"), 10mm(0.39"), 12mm(0.47"), 16mm(0.63"), 7-Piece setPackage Includes:1 Piece 6.35mm Square Hole Saw with Drilled Core1 Piece 7.94mm Square Hole Saw with Drilled Core1 Piece 8mm Square Hole Saw with Drilled Core1 Piece 9.5mm Square Hole Saw with Drilled Core1 Piece 10mm Square Hole Saw with Drilled Core1 Piece 12mm Square Hole Saw with Drilled Core1 Piece 16mm 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.