The ring is designed to fit only genuine Spyderco spider fingers Use the fixed model, and other imitations cannot be used!
Question:Will it work in a Matriarch 2 spyderco folder?
Answer:Yes fits
Question:Will this fit the matriarch also?
Answer:The matriarch is the same handle as the Endura 4, Yes it will fit
Yes, this is listed for the Endura, but will also fit the Matriarch & Delica series knives.