Anchors are used to provide a means of attachment between two or more separate elements Anchors are of two types cast in place anchors and post installed anchors Cast in place anchors are cast in the wet concrete before the latter sets These types of anchors are installed in the foundation which is then filled with wet concrete only leaving the projecting thread of the anchor bolt exposed Post installed anchors are anchor bolts that are installed after a base has been set A hole is drilled into the substrate such as concrete and masonry and then the anchor is installed into the hole