5/8-11 x 12 Simpson Wedge Anchor 303 SS (10) . WEDGE-ALL® wedge anchors are a non-bottom bearing, wedge style expansion anchor for use in solid concrete or grout-filled masonry. A one-piece clip ensures uniform holding capacity that increases as tension is applied. The threaded stud version is available in eight diameters and multiple lengths. A single size tie-wire version is available for wire supported fixtures. Threaded studs are set by tightening the nut.