I've always been happy with my Hozan and found it has worked on almost any lockring I've need a wrench for. But since you occasionally come across smaller (or larger) diameter I have picked up the odd lockring wrench whenever I found one (cheap). Quite a few are just stamped flat stock and look like they are for infrequent use, some have logos (like Honda MCs) so I know what they came from. Some have a pivot (seems like a machinist tool) that allows the "tooth" to engage a range of diameters.