Four table legs with 12 spring-button holes adjust the length of each leg from 18" to 30".  Best for leveling Roll-a-Table® on rough surfaces, or sloping campsites.  Perfect for using Roll-a-Table® while sitting on the ground or sitting on cots in your tent.  May also be used to raise Roll-a-Table® to 31" tall.  However, heights over 28" make Roll-a-Table® more flexible (wobbly) and that may not be good for your exact application.