These gaskets fit Universal blenders having plastic blade assembly hubs. The blade assembly hub is the cone-shaped part which the blades and blade shaft are mounted in. (If your blender blade assembly hub is metal instead, then see the gaskets listed immediately above.) After installing new gasket on your blade assembly, to reinstall the blade assembly in the carafe, hold the blender carafe straight upright while looking downward through the pitcher and inserting the blade assembly into the base of the carafe. This technique will help prevent the the blender from being knocked out of position during reinstallation.