For this price, one may not expect much, but they are actually very, very good.
I'm not exagerating when I say that they are as good as the "big branded" ones, of course sometimes there are differences in the rubber protection from brand to brand ( the rubber protection on these ones is good ), but I've used different types from different brands and these ones work well.
I bought two initially for a Strat ( with an assymetrical headstock ) and a Les Paul ( symetrical headstock ). They secure the guitars safelly in place ( and the Les Paul is heavy ), so I bought another one for a Explorer, another one with an assymetrical headstock.
Being short, they will hang your guitars more closely to the wall. Since you're the one who knows where you're going to apply them ( wall, wood,...), you must buy the screws accordingly.