I bought a multi tool at Canadian Tire a few years ago. It accepts 1/4'' shank bits but had this adapter to be able to use 1/8'' shank bits also so that's what I used on the router. I like to use this bit from Dremel.
http://www.dremel.com/en-us/Attachme....aspx?pid=9903 for small parts that have small radius' and I have a larger carbide burr with a 1/4'' shank and 1/4'' cutting surface that does good work cutting around larger parts.