This replacement part is a spring. Springs produce torque which can aid in many different types of actions within an engine. If a spring has been put under too much pressure, it could snap. It may also stretch and lose its shape, which would also necessitate replacement. It is recommended that work gloves are worn to prevent injury during the repair or replacement process. This is a genuine replacement part made by Dewalt. It is an OEM replacement part which will ensure a proper fit. This part is sold individually.