Powers Wedge-Bolt+ 1/2" X 8" Screw Anchors (25/BX) (7252SD) are one piece, heavy duty screw anchors with finished hex heads. They are simple to install, easy to identify and fully removable. The steel threads along the anchor body tap into the hole during installation to provide keyed engagement. Suitable base materials include normal-weight concrete, structural sand-lightweight concrete, concrete over steel deck, concrete masonry and solid clay brick. The anchor is designed for structural loading in cracked and uncracked concrete.