If you plan to use a wall hanger for your precious instrument don't buy this.
I bought 4 of this and used it for a Gibson Les Paul, Rickenbacker 4001, Fender Precision and an acoustic guitar. Now there is only bare metal left where it supports the instrument on 3 of the holders. It's just pure luck none of my instruments got damages. It might work if your instrument is very light, like a small acoustic or something.
I originally bought it because I hoped it would be nitro safe, but now I'll just get the regular K&M wall hangers and wrap some cotton cloth around.