We all know that long tail screws (drilling screws with a long length) are difficult to make, because the smaller the wire diameter and the longer the length of the screw, the more likely it is to bend and deform, so few factories will process long screws. Especially for the self-drilling nails, once they are bent, they cannot be used directly. However, Jiaxing UNITEK Machinery Technology can produce and process long-drilling screws. The current maximum length can reach 400mm. What is commendable is to ensure the length and other appearance requirements without affecting other aspects of performance.