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Decent quality converter (now costs quite a bit more than it did a few years ago) but like the other reviewer stated, this international converter does not fit the Pilot MR pen sold by Pilot in Europe. Most disappointed and a bit of a waste of money. And yes like him I did scratch the item attempting to fit it into the said Pilot fountain pen.
I'm not sure why it's so hard to find a converter for the pilot MR3 add it takes standard short cartridges but I can tell you that this converter does fit it. It is a tight fit the first time it goes on, but given that the others I'd found were too loose to stay on.
Since using it I've had no problems, it's easy to fill, and once you've loosened the hole a little it fits nicely.
Edit: refilling it I noticed the top of the cartridge has split which isn't ideal. No leakage but I'll keep an eye out for one that fits properly
The product was used to convert a cartridge fountain pen into a normal refill pen. Advertised as designed to fit any standard fountain pen it was ideal for my purpose. Well made and well designed it does exactly as advertised. There are specific fountain pens that require specialised manufacturer converters so check that your pen is not on the list of those pens which would not benefit from this converter.
Good quality and well made converter works well and is easy to use. unfortunately it didn't fit the pen I bought it to fit, a vintage Wearever pen, I was misinformed somewhere along the line but I have plenty of other pens that it does fit, my fault entirely. The ones that fit are the ones that take standard international cartridges (as it says in the listing).