Bay windows and corner window angle sections for the Kirsch 94001 Architrac system. Makes possible a hand traversing track from side to side of your window. You can open from center to each side or from left side to right side and reverse. Extruded aluminum finished in white, black, bronze or anodized. Use splice 94109-090 to connect sides to straight sections and be sure bend section has ceiling screws for support. This is for a ceiling mount or recessed installation. Priced and sold each.