The product is not suitable for thin wrists. Of course you can use it, but it causes friction which is very uncomfortable (especially in pull-ups). When Lat train I notice that not so, but the product should be suitable just for all the exercises.
If you still can not do without the support, then you should wrap the hands / wrists with handwraps. Then the hook fit for thin hands.
The quality is usually very good. The catch is large enough that it can be used on virtually every bar. Scuffs I can hardly recognize even after long use.