I've had my cheap cone wrenches for 40+ years now. I'm only using them on my own bikes and they've been all I need. They are the generic double ended flat type with two fittings on each end. don't know the sizes. If I've used them 30 times in those 40 years that would be a lot. My main wheels the last 10 years or so have been sealed bearings anyway, but I have other bikes too.