For sale is a NEW Marland One Way Backstop; Model: BC-18MA; torque cap.1800lf-ft Oil cap. 1 pints Pic.4 ID is 4-3/8" Pic.7: Length of I-beam is 49.5" width - 3.5" http://www.merckindustrial.com/sitio/pdf/Catalogo%20backstop.pdf