Three inch long wall sections with gate, suitable for 20mm and 28mm gaming.
These walls are two layers of MDF thick making them a nice .240" thick, that's about 13" thick in 28mm and about 17" thick in 20mm.
The opening in the gate is 1.1" wide to accommodate figures based on 1" (25mm) bases.
These walls are .870" tall, that makes them 4' tall walls when used in 28mm gaming and 5' tall walls when used in 20mm gaming. They could be used as 8' tall walls in 15mm gaming but they are 24" thick in that scale.