Safety Cover Replacement Part. These are Loop-Loc Retractable Swimming pool cover brass anchors designed for use with Wood decks. The top of the anchor has a slot which a regular screwdriver can be used for screwing the anchors into and out to adjust the height as needed. This type of anchoring system is used on the tarps or covers to give the cover a trampoline effect. Extra anchors are sometimes used on either side of a diving board or pool ladder. These inserts are not affected by pool chemicals. This type of anchor will not normally work on a solar bubble type of covering. Only used for Wood Decks.