10Pcs 0.6mm Carbide End Mill Engraving Milling Cutter CNC Router Bits for PCB Machine, 1/8" Shank

Great bits for guitar fret slots on fretboards. Once I got my settings dialed in (50 ipm, 9 plunge, .01” depth per pass, 24k rpm on my Onefinity) I haven’t broken a bit! Lost my pack though, just got another and did 2 fretboards and they came out flawlessly.

First off, they are a little fragile in the sense that you have to pay attention to what you're doing (mind your plunge rates and feed speeds). I did break a few but it was my fault. When used properly, they hold up great. Once dialed in, I have yet to have one fail in operation (2+ hour runs). These have been great for etching PC boards. I haven't used them for anything else but for PCBs, they have changed the game for me. I have pretty much shelved my ferric chloride for good!

Really thought these would break, but they work perfectly. I’ve slotted frets with a CNC in maple, walnut, and Bocote now with no issues.

Purchased to engrave small letters 1.2mm deep in Birch plywood using my Desktop 3040T CNC, instead of using a v-bit. Did the job required, with clean precise cuts. Would by more, but 10 looks like a lifetime supply, unless I need to use them in Aluminum.

UPDATE: I have now cut 8 mandolin fret boards using the same first bit out of the pack. Flawless! I ordered these to cut slots in a mandolin fret board. The price was significantly less than cutters offered by specialized suppliers. Coming in packs of 10, I expected to perhaps break a few to writing off the entire purchase as a bad experience. Well, one bit completed 28 slots without fail and with every expectation they'll continue cutting. Cut details are; 24000 rpm, 5 ipm, 0.007" cut depth per pass. Total cut depth is 0.080". Material is walnut.

I use these for making 1-off PCB's, and they do a great job. I can drill and mill with this bit, and each bit lasts me about 2 square feet of facing on average. I always have a couple sets on hand. I've used other brands and types, but you can't beat these for the money.

I can't speak highly enough of these bits, Ive used them for around 100 necks. The ones in this photo were all slotted with a single bit and it still hasn't broken.

I expected these to be super fragile with them being so tiny but I do a lot of detailed work and i thought the price is great, so I can afford to break a few. With a collet reducer these fit perfect and if you go slow and hold the router right, haven't broke one yet.. I'm so impressed.