Direct replacement for the red sharpener in my Lansky system. This system has served me for 19 years and I have sharpened countless knives and the plastic around the thumbscrew broke when tightening it recently. This one is a perfect replacement and gets me back to sharpening. The Lansky system is a great tool that allows you to hold an angle that I would not otherwise be able to hold accurately. I've had razor sharpening stones and tried my knives with them, but Lansky does a better job.