This 1/4" to 1/8" collet adaptor shank reducer is the mainstay in the CNC'ers toolbox when 1/8" shank bits are the only ones for the job.
Works for any bit with an 1/8" shank. You will get 2 collets. Rarely will you need more unless you have multiple CNC routers.
Fits all brand routers with 1/4: chuck collet (Makita, Dewalt, B&D, etc)
CL-48
For Vectric users, get the latest CNC router bit tool database by going to this page
For CNC’s with routers, refer to this PDF download feeds & speeds table