CDH is a joint venture of U.S.-based ClarkDietrich and U.K.-based Hadley Group and offers more than 100 years of combined experience, and technical and manufacturing expertise. We have in-house roll forming, stamping and slitting as well as internal testing and laboratory facilities. Our engineering support group is the largest in the industry, and we feature a wide product distribution footprint and first-class customer service capabilities. CDH has received ISO 9001:2015 certification for its quality management system in its Warren, OH facility. The certification has a scope of the manufacture and supply of cold roll-formed sections to customer requirements for, but not limited to, custom profiles, construction components, power transmission and metal fencing.