10Pcs Nano Blue Coat Engraving Bits, 20 Degree 0.1mm Tip 1/8" Shank Conical V-Bit

As expected.

Long lasting when milling PCB on FR4.

Pretty much the best bang for the buck if you are working with wood on a small CNC. I don't think I would recommend anything more robust than aluminum with these, and even that would need to be a very shallow pass.

Nice price for precision bits. Use them for a few projects and then replace with a nice new perfectly sharp one.

no fué lo que pedí, no busco culpables, solo quería mencionarlo, trate de hablar con el proveedor, pero sólo puedo hacerlo con amazon, que me pide devolverlo y reemplazarlo con otro producto.si bien estas brocas me sirven, no es lo que necesitaba en el momento, pero las voy a mantener igual.pero tiene muy buena calidad, terminación, y vienen empaquetadas muy bien.

Overall I'm impressed with these bits. The value far exceeds by expectations. Based on some other reviews, I was expecting sub-par performance from these bits. However, after 3 jobs I see great results and will continue using them. 10 bits at this price is a tremendous value.Update: After some additional time with these bits, I've noticed that they have an issue with clearing chips while cutting hardwood in particular. When cutting a 5mm deep v-channel in maple, the resulting channel is hard packed with dust/chips. Adding an additional finishing pass helps marginally, but there is still lots of manual work to clean out all the chips from the cut.I still recommend these bits since they are great for the price, but know that more cleanup work than expected may be needed when cutting some materials.

I bought these bits for engraving text, so sharp tip was important. Only about half of the bits are useable. One of the tips was 0.6mm(middle bit of the attached picture. The picture shows the worst 4 bits with the top bit seeming pretty good)

They are really good. Precise and sharp. Both PCB-s are milled using those bits. Tracks are 0.2mm and 0.3mm. Milled on regular Genmitsu 3018-PRO with upgraded Z-AxisSupport is very helpful!