I'm fairly sure that neither router can accept a 1/2" collet. Both are pretty light duty (8 and 6.5 amps), so don't have enough power, and aren't built robust enough, to use larger bits, which usually have a 1/2" shank. So, to use this bit you'll need to get a larger router, say 1.75+ hp (11+ amps), which specifically includes a 1/2" collet. Most full sized routers also include a 1/4" collet. Alternatively, buy a bit with a 1/4" shank. While you didn't say what shape 3/4" bit you need, FWIW Freud 04-140 is a 3/4" straight bit with a 1/4" shank. Good luck!