| 摘要 |
A tack system having at least two tack elements, each tack element including a body having upper and lower opposing faces, and a plurality of pins extending through the body and positioned in a predetermined pattern. Each pin includes a spike portion protruding from the lower face and a shank portion having a bore defining a hole for receiving a spike portion of another tack element. A first tack element may be mounted on a bulletin board or the like to attach a sheet of material thereto, and a second tack element attached to the first tack element in stacked relation to hold a sheet of material therebetween by inserting the spike portions of the second tack element into the bores of the first tack element. In order to secure the tack elements in stacked relation, the spike portions include serrations to grip the bores of associated tack elements.
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