I wasn't expecting much when I ordered them. 100 carbide tipped milling blades for less than $100 seemed a bit ridiculous so I figured there wouldn't hurt to try them. The first two cutters I used were destroyed within a minute of cutting the 4x4 teak. It's a relatively soft wood so a tungsten carbide blade should have no problem cutting through it unless the blades were actually tungsten carbide. They seem to be trying to pass off cheap, non-heat treated carbon steel blades as tungsten carbide on the assumption that no one can tell the difference. router bit. Definitely won't happen again as I threw the whole set in the trash.