This is a genuine replacement chainsaw chain. Using a chain rather than a saw blade ensures that the tool lasts longer, cuts cleaner, and requires less sharpening and care than a blade would. The chain on a chainsaw can be easily taken off and replaced by this part to make the chainsaw work smoothly and efficiently. If the old chain is rusted or not cutting well, a replacement is needed for the chainsaw.To replace the chain, first, make sure that the machine is off and unplugged. Wear gloves when working, as the chain may be sharp. Bolts on the chainsaw will need to be loosened to release tension in the chain, and then the chain can be removed from the bar. The new replacement chain can then be added to the bar and screwed back in.This OEM replacement part is sourced directly from the manufacturer. It is sold individually. It is manufactured from Troy-Bilt and for use for any Troy-Bilt chainsaw.