The unique, optional Dip Attachment for the PowerBlock SportBench allows you to perform dips off the back of the SportBench. The new SportBench Dip Attachment features a sure tension adjustment knob to keep the Dip Attachment stable during use. Weight rating for the dip attachment is 250 lbs. *Note: The Sure Tension Dip Attachment will not work with Pro Bench models bought before May 2008