Extrusion and front /rear panels material: Aluminum
Top/bottom covers material: Steel

Following is small enclosure size info from supplier.
Front panel, Rear panel, Internal size (mm)
H x L,   H x L,  h x lxt
64 × 203.5, 64 × 203.5, 62 × 179.5 × 180

Color: Gray. Color configuration is CFG1. See actual color and shape at the 2nd photo below (this photo was taken from 200mm-deep sample rather than from actual 180mm-deep enclosure)

Note: The dimensions shown in the table are only for reference (maybe exist ± 0.5mm dimensions variation).

See more info at pdf link below. Correction:  The actual standard panel thickness is 1.2mm, cover thickness is near 1.2mm.

Tip:
It requires special tool to remove plastic bezel from enclosure, otherwise the latch of bezel might be damaged. If you do not have such tool, please use large flat-tip screw driver. To make this removing more smoothly and to protect bezel, please wrap some thin foam over the flat tip of screw driver.