Hubs are used to add a second disperser blade above the primary blade. They can also be used to add a blade to the end of a shaft that is not configured to mount a standard disperser blade.
The welded hub is an integral part of the blade and must be replaced as blades are replaced.
THIS IS AN OPTION FOR OUR LAB BLADES. Best to visit disperser blade selection, and add the hub to the blade of your choice.