These are great lil' discs for cutting metal. I've used them for years in my trade (Pipefitter/Welder). Please be careful to wear your protective gear while using these though...gloves, face shield.....etc. They will do some damage to you if they were to come apart. I would hope that anyone that buys these  will already be aware of the hazards. Beside that, these discs work great for what they are designed for.