Valor Fitness EX-1 Leg Lift Attachment Can be used on the BF-38, the Valor Fitness BF-52; the Valor Fitness DD-4; the Valor Fitness DD-25 and the Valor Fitness BF-39 Adjustment pins already provided on main frame piece of equipment 1.7-Inchx1.75-Inch tubing Foam rollers provide for back of knees as well as ankles