VERSATILE
Twin 39" :12000-39SO
Full 54" : 12654-RT
Queen 60" : 12660-RT
King 78" : 12678-RT
Lowest position:
for use with a mattress and box-spring
Middle position:
for a mattress of 12" or more, typically without a box-spring
Highest position:
for a mattress of 12" or less, typically without a box-spring