Designed for use in various chainsaws, the E-Ring secures the pivot pin, which holds the handguard. It is an authentic OEM replacement part made of durable black metal and sold individually, not as part of a kit or assembly. When this part malfunctions, you may notice the handle or handguard is loose. At which point, it will need to be replaced. To complete this repair, you will need a pair of pliers. Customers rate this repair as Easy.