Made of sturdy iron, the 1" diameter rod with 0.6mm thickness provides better support which can hold up to 30 pounds without bend and sag. Compared with other rod, our curtain rod is designed with 2 end telescopic rod, so that you can adjust the length more easily and stably with any ends to perfectly fit your window size, rather than adjust the length by add or delete one fixed rod.In order to solve the problem that rod slides when push the curtain, we design the lock design on both 2 telescopic rod. Just rotate according to the mark, stretch to the desired length, and rotate to lock and fixed the length.28"-90" curtain rod comes with 2 telescopic rods and 3 same splicing rods, you can connect any number of these rods together.