CINCINNATI, OH — (Marketwired) — 04/11/13 — Diehl Steel has installed a new plate mill that allows the company to custom up to 30 inches wide by 50 inches long by 12 inches in height. Diehl can now machine larger sizes of tool steel, alloy steel, high speed steel, carbon steel, powder metal product and stainless steel to customer-s exact specifications and tolerances.With a 20 inch cutting head, the new plate mill eliminates the ridges that occur when cutting with smaller diameter cutters.