Wedgek NX2 Angle Guides for Rods with Diameter 3/8", 14 16 18 20 degrees

All new japanese / high end chinese knifes need less than 14 degree guides. 10-12degrees. haw can i get one for high end Japanese knifes?

Listing says "internal diameter: 5/8" (16 mm)", but it's not clear if that is the min or max id. will they fit my 1/2" diameter rod?

I have a 15mm (~19/32") sharpener rod. Will NX6 fit? Thanks!

Mine were just delivered with zero instructions. how do i use it for a 14 angle knife?