The cup holds a maximums diameter of 1" rod suitable for window curtain rod, drapery rod, door curtain rod, shower curtain rod,wardrobes rod Materials constructed of metal and materials,ensuring is full of durability Installation with screws,curtain rod bracket holders is installed with screws(rod bracket and all screws have included), stable widely application than curtain rod bracket none drilling Double curtain rod bracket,curtain rod holders adopts practical double holes design 1,strengthen rod brackets load bearing capacity, perfectly good for heavy rod,layering or extending over blinds; 2,curtain rod Hook hangs 2 rod & layer of grommets curtains well. 2.4inch rod spacing,wide enough to draw curtains back without fighting Wonderful gift,sweet warm friend family and yourself, Manufacturer: TSMORY