the 1/2" bit size is the diameter of the bit.... the bit IS long enough for 3/4" MDF... that's what I used it on //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gifer, I think I want that router, can you change the bit on it or extend it? 1/2" ain't helping when using 3/4" MDF. I haven't used a router much either so I don't know if I can get around the bit size