Medium thickess aluminum plate refers to aluminium plates with thick between 25mm ~ 200mm. For example, the commonly used aluminum plate thicknesses are 25mm, 25.4mm (1 inch), 26mm, 27mm, 28mm, 29mm, 30mm, 35mm, 40mm, 45mm, 50mm, 50.8mm(2 inch), 100mm (10cm) etc