Klein's Bi-metal Hole Saws are optimized for cutting steel. The blades provide the fastest, most consistent and longest lasting cutting on the market today. Heavy-duty construction includes thicker 5 mil back plates to stand up to abuse much better.. Arbor Size: 3/8. Arbor included: No. Bit Material: Bi-Metal. Drill Bit Type: Hole Saw. Drill Bit Type(s) Included: Hole Saw. Individual/Set: Individual. Material Cut: Multi-Purpose. Min Chuck Size Required: N/A. Pilot Bit Included: No. Returnable: 90-Day. Teeth Per Inch: 5. Tools Product Type: Power Tool. Bit Diameter: 3/8 in. Bit Length (in.): 2 in. Drilling Depth (in): 2. Hole Saw Diameter (in): 6-3/8". Hole Saw Diameter (in): 6-3/8". Material Cut: Multi-Purpose. Bit Material: Bi-Metal. Bit Diameter: 3/8 in. Individual/Set: Individual. Arbor included: No. Drilling Depth (in): 2. Drill Bit Type: Hole Saw