Product details:

Top to Bottom (Size: 12" H x 18" W x 1.5" D, 12" H x 18" W x 0.75" D): 12 Overall Height - Top to Bottom (Size: 18" H x 26" W x 1.5" D, 18" H x 26" W x 0.75" D): 18 Overall Height - Top to Bottom (Size: 26" H x 40" W x 1.5" D, 26" H x 40" W x 0.75" D): 26 Overall Height - Top to Bottom (Size: 40" H x 60" W x 1.5" D): 40 Overall Height - Top to Bottom (Size: 8" H x 12" W x 0.75" D): 8 Overall Width - Side to Side (Size: 12" H x 18" W x 1.5" D, 12" H x 18" W x 0.75" D): 18 Overall Width - Side to Side (Size: 18" H x 26" W x 1.5" D, 18" H x 26" W x 0.75" D): 26 Overall Width - Side to Side (Size: 26" H x 40" W x 1.5" D, 26" H x 40" W x 0.75" D): 40 Overall Width - Side to Side (Size: 40" H x 60" W x 1.5" D): 60 Overall Width