IRWIN now has a full line of bi-metal hole saws designed for the professional and made to provide long-lasting performance for use in general construction, plumbing, electrical and remodeling applications. IRWIN hole saws are intelligently designed and engineered for high performance. Made from the highest quality materials, you can count on these hole saws to be durable, dependable and a superior value. U.S.A. Bi-Metal: Yes, Material Type: General Industry, Professional Series: Yes, Tooth Design Pitch (in.): 4/6, Saw (qty.): 1, Saw Size (in.): 2 3/4