These machined aluminum tappet covers replace OEM honda PN 12361-035-000. They add a little extra bit of customization to your bikes engine. O-ring seal is included. Sold per each. I started making them for my 175 twin but they fit lots of models including CB, CL, ATC, SL, S, CM, TRX. Please reserch yourself to verify fitment. Takes a 10mm hex wrench. Pick up one of our soft wrenchs along with your order to help prevent scratching them up with a steel wrench.