| 摘要 |
A fastener for being inserted a first depth d1 through a first object and a second depth d2 into or through a second object, is provided. The fastener includes, but is not limited to, a head having an outer surface opposed to an inner surface, a shank connected with the inner surface of the head at a first end and forming a tip at a second end opposed to the first end, and an identification marking formed on the outer surface. The outer surface remains exposed upon the fastener being inserted into an object. The shank has an actual length La from the first end to the second end, and wherein the actual length La is equal to or greater than the sum of the first depth d1 and the second depth d2. The identification marking indicates an embedment depth de of the fastener. |
