These were refurbished Crossley India Pattern cars. The chassis was replaced by a Chevrolet truck chassis.
It had pressed steel wheels with balloon tires.
The engine was located in front. Behind it was the fighting compartment with a domed turret on top. On top of the turret was an observation dome. Some vehicles had searchlights mounted on top of the turret. Internally the sides were lined with asbestos to help keep the crew insulated from the heat.
One odd defensive measure was that the crew could electrify the exterior to help ward off anyone climbing on board.