Seal and snap ring kits keep the elements out and ensure your bearings continue to spin smoothly.- 1´´ PHS473 (Also for ThreadFit 24, Press Fit 24, T47 24i, and T47 24x bottom brackets)- 1-1/8´´ PHS474- 1-1/4´´ PHS475 (Also for ThreadFit 30, Press Fit 30, T47 30i, and T47 30x bottom brackets)- 1-1/2´´ PHS640