I am a professional mechanic and I usually use well-known quality brands of air tools such as Ingersoll Rand. I saw this set and was skeptical because of the price. I read the reviews and they seemed positive to me, so I decided to try them out. I received them today. I installed air fittings on them and lubricated them with air tool oil. I had to do some sanding and was pleasantly surprised at how well it works. I saw a review that said "It would be nice if they included flat keys for replacing burrs." I don't know because I had 2 flat keys. Maybe he threw them away by mistake. These little mills worked smoothly and were easy to use. I am very happy with my purchase. Time will tell if they will last but if you lube them before each use I don't see why they won't last for years.
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