DOM (Drawn Over Mandrel) refers to the process that is used to create these round steel tubes. The DOM process that takes a steel strip that formed into its initial shape and then electric resistance welded together. From here the tubes go through an annealing process they are then “cold drawn” over a mandrel to give it is uniform thickness, smooth finish, and specified dimensions. At the end of the manufacturing process the DOM steel tubing appear to be seamless and have a smooth finish. As a DOM steel tubing distributor in Michigan we provide local and U.S. based businesses with product in large or small quantities at competitive prices.