The drills in them always break, so they are replaced. You have to make an effort to make a sink, I mean a lot of effort just to get a dimple, you don't have to. These bits break easily because the countersink is terrible. PURE GARBAGE!
Pros
Durable: The drill bit part is made of 4241 high-speed steel, with higher hardness and good cutting ability, can drill quickly and ensure long-term use.