Review on 🔩 CO Z Titanium Automatic Aluminum Multiple: Cutting-Edge Efficiency and Durability Combined by Stephen Ball

Do not believe the good reviews. They are extremely low quality. They are worse than Harbor step drills. I tried drilling holes in thin metal and they broke. This is a cheap mold, not real high quality steel. You just can't trust Amazon's rating system. By the way, I work with metal, so I'm not a beginner. Trust me, they're cheap for a reason.