Although Bell has stopped production of the original style Kam-Lock (ratcheting) shields, owners of older helmets dont need to worry. This kit includes all of the hardware required to convert a Bell helmet with the older ratcheting Kam-Lock pivot to accept the newer SRV Friction-Lock Shields.The conversion is not permanent, so you dont have to replace all of your shields if you only need one new one. One kit converts one helmet (you dont need a second kit for a second shield). This kit also includes new pivot screws and a new hold-down post. You dont need to purchase any additional hardware, even if your existing Kam-Lock hardware is worn or missing.