If the holders is stainless steel brackets with 6 eyelets. The brackets can either be attached to two flexible hooks on virtually any hanging rail, or even at one. The large hook you can hang on the door it easily. They are supplied in a set of 4.
The hanger holders are about 26 cm long and 2 cm wide. The build quality is good and stable, but I would have liked a better deburring at the eyelets. These are sometimes quite sharp.
Our hangers are easy to locate, regardless of whether large or small, whether metal or plastic. Even the broad comic bow my daughter easily fit purely into the eyelets.
I take this hanger holder usually vertically, as I can so save the most space with it. Certainly, the space savings are minimal in the thicker winter clothes, but in summer clothes she is clearly noticeable.
Conclusion:
I use the hanger bracket like wardrobe and even bring with it a certain systematic order in the closet by the clothing sorted by topic into a hanger holder.