Trend 3-Inch Double-Sided Diamond Sharpening Stone, 300 & 600 Grit, Credit Card Sized Honing Stone with Storage Wallet, DWS/CC/FC

This thing really works well. I saw someone using this on YouTube for sharpening there with turning tools and this is like 1/10 to cost of all the equipment you need to sharpen the tools and much quicker and easier way so I decided to try it. I got to say I'm impressed it really does work well it's small it's easy to handle it's easy to use and it even works on the carbide tungsten tools. I invested over $300 in a bench grinder and diamond wheels and a jig to set up the tools and now I got to say that I should return all that and just keep this little card.

Happy to have this to sharpen my carbides

Love it

this stone with some Windex keeps every bit and knife on my shaper/planter/jointer in top cutting condition, excellent quality for the price and the 600 grit is perfect for putting a nice sharp edge on the cutters.

I was skeptical but this really works on my forstner bits.

This hone often produces a better burr than my CBN wheels. It seems the lapping fluid is unnecessary. Also, it is nice and stiff.

I carry this in my day bag. Recommend. For the weight and size, it's the best I've found. Price is absurdly high, though. If you just want a sharpening stone for your toolbox, there are much cheaper ones to be had.

Many pros say Trend is the way to go for diamond stones and I tend to trust their judgement. Never using one before it tends to be a bit awkward but that should work out in time. Appears to be of good quality and it works if you do your part right. I have some diamond files that I prefer but they are harder to fit into some tighter places that the credit card file fits with ease. I have used it on several Forstner bits, router bits, countersinks with average to good results. They definitely cut better than before I dressed them up.

These cards are so useful and the 300/600 grit combo is perfect for touching up various tools. Like all diamond sharpening plates they need breaking in to get the best performance out of them though. They get better the more you use them. Definitely recommend these Trend cards.

Very pleased with purchase, great for sharpening router bits etc.

A Dental Hygienist here, this is as good as any Hu-Friedy/PDT sharpening stone I've used. I love the weight and shape. Is between a fine/medium grit. A few quick passes over the instrument and you'll have a nice sharp edge. Ordered one for each hygiene kit. Sterilizes very well. One for at home to keep my paring knives sharp too! Would be great for hobbyists.

Good quality product at a reasonable price. Performs exactly as I'd hoped

Great little tool to quickly refresh a sharp edge, works well with carbide tips from turning tools.