Fits Total Trainer Models - DLX - DLX II - DLX III - Adv. DLX - Pilates - Pilates Pro - 570 - 2000 - 2500 - 3000 - 4000 Black All bearings are included and is equipped with 12 gaskets,no extra purchase needed. Wheels are crafted from upgraded material for smoother operation and lower noise. Lab and gym tested and approved for reliable quality.The diameter of the bearing thru hole is about 0.45 inch. Please confirm the dimensions carefully before placing your order. If you are not sure whether this kit fits your model, please feel free to email us or comment in Q & A.