... 10-12mm Track1)1.Material:aluminmum;2.Finish:Aluminum;3.Quality:high quality with competitive price;4.Packing ... assistance of any frame .both upper and lower door bars can not only offer necessary system stability, ... who are specialized in producing glass door fittings like sliding doors, moving gates, handle ... try our best to meet your demands. Aluminum Upper Track for Folding door system