YUNVI48 Pieces High Hardness Diamond Chainsaw Sharpener-Titanium Plated Burr Stone Mini Chainsaw Sharpening Stone Grinder Tool for Electric, Stone Carvings 16 Pcs Each Size（5/32''，3/16''，7/32''）

look good but have not used them yet

It got the job done without breaking and the chain is sharp. I was expecting a little more from these but it got the chain sharp and I'm guessing it will do a couple more sharpenings before needing changed. It is faster than filing and I'm using it on a cordless dremel.

Compared to a regular stone grinder it doesn't seem to make the teeth of your chainsaw hot as quickly as a stone grinder does. But it takes a little longer to sharpen. I believe the Heat from sharpening is going into the sharpening bit and I believe that is making the adhesion of the diamonds let loose as it just started peeling off. I'm going to try using some more as I did like the fact that it did not overheat the chainsaw teeth but I didn't even get one chainsaw chain sharpened with the bit pictured. I had to grab a second one, and at the increased cost of this over a stone grinder bit, I'm probably going to stick with them rather than these Diamond bits. I sharpened my entire chainsaw blade on my other saw and the stone grinder bit was still in good shape. You just have to do a little at a time to keep the teeth from getting hot.

Si buena

Cheaply made

The three sizes are just mixed together in one bag. Would it be that hard to bag each size individually? I assume from other reviews that they will function well, after I spend 5 minutes sorting them.

ground well but the diamond fall off the shaft

The bits fit well in a dremel tool. Multiple sized bits were great fit for my various saws. Definitely a quicker and easier way of sharpening, but the bits wore out a little quicker than I thought. But for the price, and convenience I really can’t complain. Each bit may give you 3+/- sharpenings, depending on the condition of the chain.