Here is an interesting article about wading studs for boots: http://www.flyfisher.ro/en/wading-studs-for-boots/
It is about how they are frayed after one fishing season and how to make better choices when you are looking for durable studs for your wading boots.
Another aspect to take in consideration is that a boot with metallic studs will make noise in water. So if the river is small is better not to wear these type of boots and to choose to wear vibram sole boots or felt sole boots.
So if you are interested in buying quality and durable studs for your wading boots here are the good ones
And don’t buy these ones: