Hi Guys, I'm renovating my Dave Yates custom mountain bike after a 7 year break. I need to replace some of the bolts such as brake boss bolts, bottle holder bolts, front derailleur pulley bolt etc. I've found a place that does all sizes and lengths of allen head bolts but don't know what metris sizes they need to be ie M3, M4, M5 ? It'd be cool if someone could help with this one .