Drill Bits Sharpener,3mm -15mm Drill bit Grinding Machine MR-13A, 95° to 135° Point Angle Re-Sharpener, Portable Bits Sharpening Machine with 13 Collets，All-Metal Housing

First, like most people have said, the instructions for use are lacking. Other than that, I am extremely pleased with the product. I bought the one that goes up to 3/4 inch bits and it works just fine on the larger bits as well. I’ve probably sharpened about 200 bits so far with no issues whatsoever. I would highly recommend spending the extra money to do the split point. I’m sharpening all my bits now to 135 degrees with a split point. I had a drill doctor before and this works way better. As for the seller, we had some misunderstanding on what was included with the product based on their description, but to their credit, they recognized the discrepancy, corrected the description on the listing, but even better, they honored their mistake and sent me an extra sharpening stone. Good on them! I will add, up to this point, I see no wear on my existing grinder stone and the entire unit seems very solid. If I had any other complaints, it would be that the individual collets are not clearly marked and I think the holes that they are stored in could be better marked. Also, it would be nice if there was a place to store the chucks that hold the collets ( mine has two, since mine goes up to 3/4”) with the machine. Other than that, if you can afford it, it’s a solid product and I am very pleased with it, especially compared to my drill doctor, which I have now parted with. Yes I would recommend.

I've ground drill bits in various ways, free hand, jigs, drill doctor. This is a better way to go and set up is quick. The collets spring enough that I can sharpen metric or standard from any number sizes, to letter sizes and fractional. One thing I did was modify an er40 collet chuck to fit this machine and it sharpens up to one inch. I happen to have the collets on hand that fit the larger sizes. It's really nice to drill and sharpen easily between uses. I've sharpened in excess of 50 bits so far.

pretty cool tool to have if you need to sharpen a drill bit or two or three......

I've had the unit for nearly a week now and sharpened a couple dozen drill bits. So far honestly I'm pretty impressed over all. I have a few complaints but they aren't insurmountable. Here are my thoughts and notes about this unit, what I like and what I don't like.Positives:> I can't speak to durability, but the sharpener feels as most others have said about similar/probably identical units.> It has both the ability to split point and web thinning (big plus in my book). If you have to chose between one or the other you can get a model with one but I would always choose the one with the web thinning.> Setup and use is rather simple and easy once you understand how it works, but that is the same for all of these companies selling what appears to be the same machine. Watch a few YouTube videos and you won't need the manual provided.> Not sure about the other sellers but this one came with imperial (fractional) ER20 collets rather than the metric ER20 collets. The actually used a label gun to label over the metric numbers pressed into the sheet metal which was kind of cheesy. I actually removed the label because the raised numbers in the sheet metal left the labels only partially in contact and with the oil on the unit it was going to just fall off with a good breeze. Cleaned it up and used a permanent marker to provide a designation for each size collet.Negatives:> The label on the dial for adjusting the web came with a fractional label but it wasn't applied and no clear way to define where and how to set that label. So it is a bit of a guessing game here. Not sure if they removed the metric label and just forgot to adhere the fractional one or what. I played with this a little and think I have a rough idea where this should be and to be honest I think it is a very crude setting anyhow.> Amazon description had conflicting statements about what collets it comes with and how many. As noted it came with fractional collets, but it stated in the description it was to come with collet sizes 3,4,5,6,7,8,9,10,11,12,13, 14,15. It only came with 11 (not 13) collets. 11 collets (3,4,5,6,7,8,9,10,11,12,13) is what most of the units come with but what is strange to me is it should be at least 12 if you were to be able go through all of your drill bits 1/8" through 1/2", but that leads me to my next point.> The 11 collets provided starts at 1/8" in 1/32" increments, but if you do the math that would be 12 collets. For some reason it seems that many of the Chinese imperial fractional collet packages you can get here on Amazon are also missing 15/32". The collets relatively comfortably accommodate 1/32". So a 1/2" collet will comfortably accommodate 1/2" and 31/64" and even 15/32, but it is a stretch to use one collet to accommodate a 1/16" range. I made it work but it is probably not good for the collet.At the price point here when I bought it for $330 that I am happy with the results I have gotten out of it, but a few $ more they could mitigate what seemingly are very easy things to resolve. I'll be out looking for a couple extra collets, but definitely I'm looking for the 15/23" collet for sure.

Tasks a bit to set it up. Perfect sharp every time.

The Good: This is just the tool is going to save me so many trips to the hardware store. It sharpens bits to a fairly high level. In fact the cheap bits I've sharpened are better than new!The Bad: The documentation for this sharpener is lacking and poorly translated, but there are plenty of videos online to explain it's function.The Ugly: the sticker to indicate sharpening angle was loose, but I'll forgive that in such an inexpensive unit.

Glad I took a chance on this - I’m happy with how well it works. Sharpened several drill bits after watching some YouTube videos. It was fairly easy to fine tune the split point back angle. Was able to get nice results on both high speed steel and cobalt drills with different angles. Didn’t find any issues sharpening fractional drills with metric collets. It will be nice to always have sharp drills ready when doing projects now.

Very happy with purchase makes sharping drill bits easy