The Eaton B-Line B2015PAZN 3" Rigid Conduit Pipe Clamp is a set of 16 steel clamps designed for securely holding 3-1/2" O.D. pipes. Made in the United States with a zinc finish, these clamps are durable and corrosion-resistant. Perfect for use in various industrial and plumbing applications, the B-Line clamps provide a reliable and stable support system for pipes and conduits.