Buy an expensive metal drill bit (high-end HSS, Titanium, Carbide-tipped, Cobalt), or you may need two to three of the cheaper "generic metal" ones.
@JonoMarshall started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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Buy an expensive metal drill bit (high-end HSS, Titanium, Carbide-tipped, Cobalt), or you may need two to three of the cheaper "generic metal" ones.