Concrete Wedge Anchors are ideal for hanging ceiling grid systems from concrete decks. Installs quickly and easily using a hammer drill and a 1/4" drill bit. Simply drill the hole, pound the anchor until it's seated, set the anchor either pulling down on the anchor using the claw end of your hammer, or tie your ceiling wire to the anchor and pull down on the wire. These anchor are great for poured concrete and spancrete applications. Not recommended for dry powdery block or clay tile applications.