Review on Plastic Self Drilling Threaded Self Tapping Mounting by Andrew Dickens

Extremely easy to break. I've had plastic anchors stronger than these. And forget about self-start. The liners break and when you try to "tap" them into the case they break. I have used thousands of these in my life and can honestly say they are the worst anchors I have ever come across. They're basically on par with the cheap ones you get with Walmart's substandard chipboard floating shelves (which I wouldn't trust even with a jacket, let alone a drywall shelf).