Norco Flat Base with a 5-ton capacity measures 3-1/2" x 6-1/2" for use on rams with a 10-ton capacity. This heavy-duty base provides firmer and more stable footing for rams, featuring a rectangular design with a 1-1/4 x 11-1/2 female connection. Note: When cylinders are used with maintenance set attachments or components, the maximum system pressure must be limited to half the rated pressure. Also, local sales taxes will be applied to ALL Norco orders shipped to California.