Description:Brand new and high qualityCompatibility: All 5, 6, 7, 8, 9, 10, 11 and 12-speed derailleur chains that use a master link.Features:Designed to fit externally ringed bottom brackets.Install tool preload tensioning tool.If in doubt there are some great videos on YouTube covering the installation of Hollowtech II Bottom Brackets.Type:bicycle install spannerSize:24cm x 5.5cm x 2.7cmWeight:197gColor:balckPackage includes:1pc bicycle install spanner