This is the "Spider Assembly" for the famous Tagit B-2.5 Vibratory Tumbler. The Spider mechanism is the "heart" of a Tagit tumbler. It includes a new shaft with two new bearings already assembled to the proper parts. So if your shaft is making noise or is stiff to turn (or the motor has trouble making it turn), try replacing the Spider Assembly--it is a lot cheaper to buy just the Spider Assembly rather than a whole new tumbler. Comes with a brand new set of four suspension springs also. This unit is new and carries a full manufacturer's warranty.