There is only one Unistrut metal framing system. it incorporates the innovative product improvements that our research and development group has created to give you the most complete and flexible support system available. backed by our worldwide network of engineering and distribution centers, Unistrut provides customers with total resource capability. A North American network of Unistrut service centers - stocking standard Unistrut components - are located in principal cities to serve you quickly and directly. many service centers are equipped to design and supply drawings for any type of metal framing application and also offer fabrication and installation services. designed to carry the heaviest loads and provide the widest variety of applications, the 1-5/8 in series has become the accepted standard for use in mechanical, electrical and general construction applications where supports and attachments must meet the highest strength requirements.