Fastening assembly

A fastening assembly, comprising:

• at least one fastening screw, comprising a head section having a plurality of first tooth elements at a lower surface thereof, and a screw fastening section at a lower portion thereof for fastening to an interior of a work piece;
• and
• at least one fastening accessory, comprising a plurality of second tooth elements and a plurality of third tooth elements at upper and lower surfaces thereof, respectively;
• a plurality of grooves formed between the second tooth elements, and an embedding recess formed at an upper portion of the fastening accessory thereof;
• wherein, the fastening accessory is accommodated around the screw fastening section at the lower section of the fastening to embed the head section of the fastening screw into the embedding recess at the upper portion of the fastening accessory;
• the first tooth elements are correspondingly lodged into the embedding recess of the fastening accessory to closely fasten the fastening accessory to the lower portion of the head section of the fastening screw;
• and the third tooth elements are engaged at an upper surface of the work piece to fasten the fastening accessory to the work piece, thereby forming a dual screw fastening structure with the fastening screw at the interior and at the upper surface of the work piece.