I bought this to upgrade the non-metal Just A Nut I have on my Corvette $$ 5-string. It' precision engineered, so already fitted the strings, perfect width and depth, glued in easily and of course allows for perfect string height adjustment. It looks amazing, but also now gives me bell brass frets and nut for consistent tone.
It's a great upgrade, improves the looks and tone - it's not cheap, but sometimes things are just right to do, and this is one of them.