This belongs to the RECTANGULAR BAR category of parts that follow the ANSI standard for Metal Shapes. Type specification is: FLAT BAR, ASTM A6/A6M. Size specification is: 4-1/2 X 3/4 by 72. These models are all available in a precise CAD format, accessible to users of Alibre Design. You can use Alibre Design Xpress at no cost for any amount of time, along with the free integrated Alibre 3D Publisher for Google SketchUp. Click the link below to get information on the best value in 3D CAD.