The shelf mounts to door using the Door Bar Grid Straps (sold separately). Shelf is 16 gauge steel with 12 gauge brackets. Shelf finish is RAL 7035 textured light-Grey polyester powder paint. Locks in two positions 90 degrees as a shelf and 15 degrees as a writing surface. Also mounts to three-row grid straps, side or back panel, or any flat surface. Holds up to 30 pounds.