also, EAI cogs & DA lockrings. almost anything widelsy available will work fine, but I (and many other forum users) am partial to this combo. the Pedros Trixie tool is fine for most of it's applications, but the spanner is damn near worthless. the tool is too short to get good leverage with it. use something made specifically for this purpose, not a multi tool with a bottle opener attached to it. your life could be riding on it.