Key Features: The BBP-AOS is used in conjunction with the BBP-1.2 Bottom Bracket Bearing Press Kit to extract press fit bottom bracket bearings, cups and adaptors,The BBP-AOS utilizes an expanding collet and extractor cup system to safely remove bearings without requiring impact,Also included are eight installation drifts for pressing bearings into pre-installed cups,Organized in a convenient storage case,Full list of compatible bearing inner/outer diameters found on instructions/parts diagram,NOTE: The BBP-AOS requires the BBP-1.2 Bottom Bracket Bearing Press Set for useMade in the USA and covered by Park Tool\'s legendary limited lifetime warranty.