Size Front Back Depth Leg Height Weight
18" 18" 13" 12" 2 1/8" 17 lbs
21" 21" 16" 12" 2 1/8" 18 lbs
23" 23" 18" 12" 2 1/8" 19 lbs
27" 27" 23" 12" 2 1/8" 24 lbs