Hole Saw, Primary Saw Application General Purpose, Tooth Material High Speed Steel, Arbor Design Not Included, Saw Dia. 4-1/8 In., Max. Cutting Depth 1-5/8 In., Application Mild Steel, Stainless Steel, Nail Embedded Wood, Plastic, Duct, Pipe, Tube, Nonferrous Metals, Teeth per Inch 4/5, Pitch Style Variable Pitch, Thread Size 5/8 In.-18, Replacement Arbor No. Mfr. No. 49-56-7210, 49-56-7240, 49-56-7250, or 49-56-9100, Pilot Drill Size 1/4 In. dia. x 3-1/2 In.L