16 gauge mild steel. Powder coated for indoor or outdoor use.

The item does not come with mounting hardware.

Product Dimensions (inch):

• 12 - 11.5" x 8"
• 15 - 14.5" x 10.25"
• 18 - 17.5" x 12.25"
• 24 - 23.5" x 16.5"
• 30 - 29.5" x 20.75"