Review on High-Performance NGe Carbide Stainless 🔩 Steel Sheet: Durable and Long-Lasting Metal Solution by Oso Mears

I bought two packs of 21mm carbide tipped hole saws. I received it, the box says 21mm and the bit itself has 21mm engraved on it. I drilled five holes in 1.2mm thick 201 stainless steel and they ran like clockwork. I bought two packs because they were cheap and figured even if I break one I could probably still get through five holes, but the first went through all five and is still sharp. This is for brewing, drilling and assembling cookers at home. I will never use a step attachment for this again, an absolute dream. However, the seller looks like an idiot or is intentionally deceiving. These are 22mm bits marked 21mm. The attached picture shows the actual size of the hole drilled in the aluminum test piece. In fact, two weeks after I bought them, the same product page now lists 22mm bits. I noticed that after drilling. I can still do it with 22mm holes but now I have to buy different spacers etc which is a big inconvenience. The $11 product gave me a $20 problem that I need to spend more time solving.