Standard International Converter Schmidt K6 (Screwed)

The screwed mechanism gives a reassuring click when I twist it in, and it holds the ink without a single drip. I've been using it daily for two weeks and the fit in my international pens is still rock solid.

The screw mechanism seats so firmly that I don't worry about leaks even when the pen rattles around in my bag. It's a simple, solid fit for my international pens, and I've had no issues filling it up.