These structural rails are ideal for building large-scale optical systems. The four 10mm thick wings on the corners act as a set of dovetails for the XT95P2 carriage. The T-Slots that run along the length of the extrusion accept XT95N2 M6 and XT95N3 M4 T-Nuts, which allow mounting of components directly to the rail. An extensive line of additional components has been added to this series in an ongoing effort to increase its versatility.