Can be used on corded curved Erail tracks, it works with all suspension components such as the ERL1401, TRA1301, TRA101, TRA1501, TRA16 range and TRA1801 but the extended top plate is designed so that the bracket can be screwed directly into a fixing surface using the smaller holes at either end. The top holes work as an offset plate on curved overlap tracks. We recommend spacing the Suspension Brackets at 1.5 m or 5 foot centres.