Review on 💎 XCSOURCE 6X8MM Tungsten Carbide Burrs: Premium Rotary Drill Die Grinder Carving Bits - Set of 1 for Precision and Efficiency (BI044) by Jason Hymon

It's hard to write a review on something that costs less than 1/4 the price of a good product. However, I don't know what I expected for €15. I bought them to relocate the cylinder head. I have a bat with a really good name and needed the bits to get into smaller areas of the head. They are very sharp and will pierce the cast iron until it comes out of the shaft. They seem very unbalanced at 25000 rpm. The bits bounced off the cast iron and began to vibrate, and at that speed they soon self-destructed. You can also see one of them actually still bending in the pavilion. I think the main issue is that it's a two price design and not a solid piece as you can see in the picture that's fully disassembled, it's soldered, they all use the same shaft. Do they cost $15? Maybe, but now I need a plan B.