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Made in USA Bi-Metal Construction M3 Cutting Edge Positive Rake 5 Variable Pitch. Rc. 63-65 Diameter: 4" (101.6MM) Pipe Tap Size: 3 1/2" (89MM) Pipe Ent. Size: 3" (76MM) Cutting Depth: 1 15/16" Cuts through 2" x 4"s Red Finish Used On: Wood, Plastic, Machinable Metal, Nail Embedded Wood, Plywood, Pipes, and Light Gauge Stainless Steel. Use Arbors: ARB-3, ARB-4, or ARB-5 with (5/8"-11 Thread)