I have two dedicated 8mmx10mm bleeder wrenches - an OEM and Lisle. Both work fine (so far), but the Lisle (a little more expensive and known for quality tools) has a little more play than the OEM. They are both six sided and not flank drive types. The Lisle has a matte finish while the OEM is polished chrome. I don't know about the history of their bleeder wrenches (Lisle), but the one I have now was made in China - I don't recall where the OEM was made, but I'm sure it's not USA made.