This is the industrial size Blue Loctite. As in, buy this one, and you'll probably never need threadlocker for your knives ever again. It's 0.2 Fl OZ (6 mL), and I've literally had one that has lasted 10 years.
We recommend Blue Loctite for all your knife screws, pivot screws, frame screws, clip screws, and any other screws you want to stay put. Loctite prevents screws from sneakily escaping.