This bottom bracket socket is for use BSA30 16 notch bottom brackets. What makes our bottom bracket sockets unique? Made with the same top shelf aluminum alloy, to the same exacting fit and tolerance as the rest of our socket range, these sockets won't chew up your shiny new bottom bracket. Compatible with: FSA Mega Evo Wheels Manufacturing bottom brackets using a "48.5mm" tool pattern Not compatible with: Hope BSA30 or TorqTite Made in Bend Oregon