These caps protect the thread in installed SP58 anchors when not in use. After removing the object that was attached to the anchors, snap one cap into each anchor. The caps are tight fitting and will not dislodge even under vehicular traffic and pedestrians walking over the anchors.
To remove the caps, use a sharp wood chisel. Do not reuse the caps, as they may no longer seat properly once removed.
The caps come in a bag of 24.