Fit Rod Dia.(Approx) : 24mm/ 0.94"Made of metal for a lasting life.Single groove, Hook Shape, Ceiling mount.Just need to press the rod into the groove, the ribs will fasten it.Need some screws to install them, but screws are not included here.Features: Single groove, Hook Shape, Ceiling mount.You need some screws to install them, but screws are not included here.