The Ridge Tool Company, maker of Ridgid brand tools, is based in Elyria, Ohio. The company opened in the 1920s and the manufacturing plant was first located in North Ridgeville, Ohio. Ridgid makes tools for the plumbing, pipe fitting, HVAC and electrical contracting industries. Ridgid will always be known for its famous red pipe wrenches and pinup calendar (the calendar has been produced since 1935). Ridgid manufactures hundreds of tools for professional contractors.