Extender legs to increase height of original and stretch machine frames to three different levels. Includes leg levelers for uneven floors. Available in sets of 5 or 6 depending on the number of legs on your center support, for the same price. Available for either the MQF (purchased after 5/15/06) and previously purchased MQF ST frames. Now included with all stretch frames purchased after 5/15/06. Please specify if you have a one or two legged center support on your MQFST or a MQF frame.