Medium thickness aluminum plate refers to aluminum plates with thick between 6mm ~ 25mm. For example, the commonly used aluminum plate thicknesses are 6mm, 7mm, 8mm, 9mm, 10mm, 12mm, 12.7mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm etc