This base allows you to attach the catenary mast (LGB 56301) and the standard catenary mast (LGB 56405) securely to your LGB track. The base includes an adjustable clip (5.5-30 mm / 7/32“-1-3/16“) to attach the mast to the track. The catenary mast slides into the base. If necessary, it can be secured with a screw (included).