3mm Duraflect copper-free mirror panels have a 400lb Category II safety backing Includes two panels (24 1/8 in. x 78 1/8 in.), steel track and channel, and installation hardware This door can be used for commercial applications Track and channel for all orders come standard length and will not be custom cut to size ordered. This is due to out of square opening conditions and measurement errors. Customers will need to "trim to fit" at time of installation. Fits opening from 43 in. to 48 in. in width Fits opening from 80 in. to 81 in. in height Standard opening widths available: 47 in., 59 in., 71 in., 83 in., and 95 in. Standard opening heights available: 80 1/2 in. and 96 in., adjustable +/- 1/2 in.