4Pack Black Tension Curtain Rod for Windows 28 to 48 Inch,7/8"Small Shower Cu...

Mounting Type: Tension Mounted. Mounting Type: ‎Tension Mounted. Tool-free install: twist to extend, grip on glass, wood, marble, tile or plaster,no drill. Fits 2848 in and 2436 in windows. Splicing span: two-rod combo 27.237.4 in, three-rod combo 39.850.1 in; gap 37.539.7 in unsupported.

eBay