Tool with quick-release drill bits

A tool assembly for screwdriver with quick-release drill bits comprising:

• a bit main body having a shaft, and an outer periphery of a front end thereof comprising a plurality of axial cutting surfaces to form a connecting portion with a polygonal cross section, and an external diameter of the connecting portion being smaller than the shaft such that a flange formed at a connecting edge between the shaft and the connecting portion, and a housing hole penetrating through an outer surface of the connecting portion;
• a sliding sleeve comprising a rear end and a front end which are respectively close to and away from the main body, and a driving hole with a polygonal cross section axially penetrating through the sliding sleeve, and a substantially wedge-shaped engaging groove, which is formed at an inner periphery of the driving hole, located adjacent to the rear end of the sliding sleeve, and a guiding surface located between a front end of the driving hole and the engaging groove;
• and
• a spring and a locating bolt sequentially put into the housing hole of the main body, and the sliding sleeve connected to the connecting portion of the main body through the driving hole;
• wherein when the locating bolt is pushed into the substantially wedge-shaped engaging groove by the spring, the rear end of the sliding sleeve and the flange are configured to bear against each other, thereby limiting the maximum sliding displacement of the sliding sleeve on the main body.