| 摘要 |
A fastener made of a synthetic resin material is usable for both a circular engagement hole and a square engagement hole which are approximately the same in size, and includes a head, a leg depending from the head, and two groups of vertically multilayered flexible fins formed on a periphery of the leg so as to extend radially outward. Some of the fins stay in the engagement hole and are flexed by the wall of the engagement hole when the leg has been inserted into one of the engagement holes and others of the fins are thrust out of the engagement hole and restore to their respective original states, thereby preventing the leg from being extracted from the engagement hole. The leg has a lateral cross section circumscribed by both the circle of the circular engagement hole and the square of the square engagement hole and includes a pair of opposed arcs registering with the circle to hold the leg concentric with the circle and a pair of opposed parallel straight sides following the arcs and registering with parts of opposed sides of the square to hold the leg concentric with the square. Each of the two groups of flexible fins forms an angle of 45 DEG to the parallel straight sides.
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