Blade Material: Hardened Steel. Number in Package: 5 pk. Hole Saw Diameter: 1-3/8 in. Color: Red. Color: Black. Hole Saw Cutting Depth: 1 in. Diameter: 1-3/8 in. Storage case holds up to 5 blades. Small enough to fit in a pocket or tool belt. Replacement blades are made with hardened steel which increases blade life. Blades for #2360394.