Photo Shows HT105S

Length of HT104S is 38-1/3 inches
Back Tray is 9 inches high.  Middle Tray is 6 inches high.
Depth (distance from the front of the bottom tray to the back of the top tray) is 18 inches.

HT104SB Humidi Grow Tray - Black - Set of 3 HT104 With Free Stand $72.95