Material quality request:Outside slot hull is manufactured in aluminum alloy,outside slot hull's width 40mm ,height 14mm ,thickness 1.0mm or 1.2mm .(marks thickness differ±0.05mm)glass clip is made of the aging admixture of anti-enhancers and high class plastics ,can install 150mm（100mm）* 5mm glass ,the other inner parts which spread to move the accessories are manufactured in sheet iron ,iron accessories are electroplated in zinc and spray coated.