Designed to allow flush mounting of the UPS into 19-in wide telecom/relay (single mounting rail type) racks. Product Type: Rack Shelf Product Type: Rack Shelf Manufacturer Part Number: RS500 Manufacturer: Vertiv Product Model: RS500 Product Name: Flush-Mount Shelf for 19 Wide Telecom/Relay Racks Brand Name: Liebert Brand Name: Liebert Country of Origin: China