I've been curious for a while about the great performance of the Iwasaki carving float/files. I've see claims in a couple places that the tooth profile includes a "built in chip-breaker" and finally got curious enough to see for myself. I think this is a case where a picture is worth more than any number of words, so without further ado here's the toothing of an X-fine (red handled) Iwasaki:
The "breaking faces" are set back about 0.15 mm (~6 mils) from the edges, and are about 0.1 mm high (~4 mils). That's lower-profile than most people around here seem to use, but consistent with the famous Kato/Kawai video, which showed the shaving breaking quite low on the cap iron face.
These are REALLY well-formed teeth for a file/rasp/float. I also took some shots of a medium Iwasaki. They also have the "ledged" profile but on a larger scale and not quite as crisply formed.
EDIT: The image above was shot at 5:1 magnification with a full-frame (36 mm x 24 mm sensor) camera, meaning that the entire frame is 7.2 mm across. You can see 6 teeth in the image, which is consistent with the stated pitch of 1.2 mm/tooth.