1/8" Air Micro Grinder, 3mm Pneumatic Micro Air Pencil Die Grinder Polishing Tool Kit，70000 RPM Free Speed for Cleaning Dies, Rotors, Backing Plates, Brake Pads, Mounts, Etc.

Light weight and very smooth pencil grinder

I did not give this 5 stars because the instructions are in a foreign language I can not read. That said, there are good instructions on YouTube to answer your questions. Also, it does not say what PSI is max. Others like it that run 70,000rpm use a PSI up to 90. I am using it on wood and find that 60 - 80 works just fine so I have not even tried up to 90PSI.The fitting that comes with it does not fit my air supply but we had extra parts laying around so it was not a big deal for us - but you need to know and most of the cheap ones will not come with the right fittings. It also does not come with an air regulator. You can buy one for in line or set the one on your compressor - but you do need one.Due to shipping restraints they could not include the bottle of oil and there are no instructions in English that tell you how. Try YouTube. My guess is most of these work the same.It comes with two colettes. I needed one that was even smaller so I used one from my Dremel and it worked. For fine stuff I use 1/16 and it does not come with that.Before changing bits be sure to cut off the air supply at the hose and not the handpiece. Be sure you are holding the pen when you turn the air on.Now for my performance review - I will be honest, I did not expect much from this and I was pleasantly surprised. It is awesome. Since I got it yesterday and just played with it for a while last night at the power carving meeting, I have no idea about it's longevity but I think if you are careful with it and don't use too much PSI it should last a while. Keep it oiled (again, no idea how often to oil it)Over all, I think it was a good purchase. My friends liked it and plan to get one too. After I have had a chance to get into it more if I need to I will update my review but for now I like it

For the price it works amazing unfortunately it comes with a hose adapter it doesn't fit anything from Home Depot or Lowe's hardware so I had to make my own fortunately enough I'm good like that! Surely there is always a simpler solution but I enjoy the challenge of solving the problem myself. Or I'm cheap u pick

I agree with Richard. Fittings are bizarre and nothing close to US fittings. Shame I had to modify right out of the case before I could use it. He’s right, 3mm is not 1/8”. Lessons learned, pay attention to reviews before purchasing.

DO NOT BUY THIS!!!!! The listing is a lie, there is NO 1/4" NPT thread anywhere on the device. The proprietary air fitting is permanently crimped to the air hose, and it cannot be removed. I tried to buy from Amazon for the convenience, but instead they lied in the description and provided me a chore to go return it while they hold my money hostage for 7 days.

Nice quality, but what’s up with the air line connector? It doesn’t fit any American quick change fitting. Had to modify it...

Trash! the connection that is in the ad is 1/4 and the one that come is huge and nothing can be connected in itThis is some bull crap after all the waiting now it doesn’t connect to nothing in USA

Living it. Works great, never used a pneumatic one before only Electric