| 摘要 |
The shank portion of a screw, which is free of a drill bit portion and which is adapted for use with a fibrous board, has a surface that is formed with a screw thread throughout the length of the shank portion, and a lower section that is formed with a flute at the surface thereof. The flute extends from a tip of the shank portion and has a longitudinal length which is inclined with respect to a longitudinal axis of the shank portion. |
