| 摘要 |
A screw spike having a specific groove is provided to allow a user to take out the screw spike with a specific groove when the groove formed in the center of the screw spike is worn away. A screw spike having a specific groove comprises a body of a cylinder type, including a screw thread, inserted inside an object and in order to fix the object; and a head unit, including a groove of the flat or the cross shape, receiving pressure with the external force in order to deliver to the body. The head unit including the specific groove can make the screw spike inserted into object be easily removed from the object when the flat or the cross groove was worn away.
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