This is a set of two Beamtec DRS-W-RIII lighting rail extension parts. - Brand: Beamtec - Product Name: Lighting Duct Rail - Model Number: DRS-W-RIII (White, Right) - Type: Lighting Rail Extends from: 50cm to 100cm 100cm to 150cm 100cm to 200cm 150cm to 200cm Two 50cm pieces: One is brand new and unused. The other was used, but removed after noticing a difference in the groove direction after tightening the screws (see photo 5). Both are for use on the right side, but the groove direction can be aligned by attaching the opened one to the left side.