After owning a few screwdriver sets, I saw a New York jeweler using these on a Tick Tock video and I thought the top of the drivers were encrusted with diamonds. That's the kind of detail these drivers have! I searched the internet, found JewelrSupply.com and bought these. Blued steel, not made in China , and sized down to ,3mm these are perfect for that tiny screw that is really in there and bends the cheap China crap. These come in their own wooden box, easy to keep on the workbench and not get mixed in with other screwdrivers at the end of the day. The fit and finish is what you would expect of tools of this caliber. If you are serious about needing quality tools for your cell phone, or watch repairs these are the ones, and this is the place to buy them.