Retractable bit storage system

A bit or tool holder attachment which is used to attach on an electric drill or an electric driver or power tool or manual tool, comprising:

• a main body, having one end extended with a connecting body to be mounted on the electric drill or the electric driver or power tool or manual tool, and at least one string and at least one cable retracting device are arranged in the main body, and one end of the string is fixed on the cable retracting device, the other end passes through a hole on surface of the main body and is fixed on a fixing body, and the fixing body is located on outer surface of the main body;
• and
• at least one bit or tool holder, having a movable body and a fixing ring, an attaching hole is arranged in middle of the fixing ring for a bit or tool to pass through and be attached in the fixing ring, and a ring-shaped recess is also arranged on outer surface of the fixing ring, and the movable body is sleeved on the ring-shaped recess, and one end of the movable body is connected with the fixing body, so that the bit or tool holder can be extended and retracted relative to the main body;
• wherein when the bit or tool attached in the fixed ring is installed on the electric drill or the electric driver or power tool or manual tool, the movable body can rotate on the ring-shaped recess relative to the fixing ring, so the string will not be wound around on a chuck of the electric drill or the electric driver or power tool or manual tool;
• wherein when the bit or tool attached in the fixing ring is separated from the chuck, the string will be automatically retracted by the cable retracting device, so that the bit or tool holder automatically returns to the surface of the main body.