| A | Mild Steel 14 to 15 Gauge |
| B | Mild Steel 16 to 23 Gauge |
| C | Mild Steel 24 Gauge and Lighter |
| D | Hard Aluminum |
| E | Soft Aluminum |
| F | Brass |
| G | Copper and Lead |
| H | Fiberglass |
| L | Plywood, Hardboard, Pressed Board, etc. |
| J | Alliance Wall, Color Wall, Mirawal and similar metal laminated panels, drywall, fiber cement board |
| K | Plastics, plain as Lucite, Plexiglas and decorative laminates as Consoweld, Formica, Micarta, Texolite and Panelyte |
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