Internally threaded. Wedge anchor performance with the convenience of a drop-in. Safety shoulder. Supports clip when anchor is under strain, eliminating bolt-end collapse and/or clip slippage under ultimate loading conditions. Seismic rated. Allowable values may be increased 33-1/3 percent for short-term loading in resisting earthquake or wind loads. Numerous head-style options. May be used with machine screws, tamperproof bolts, threaded rod, and a variety of other male-threaded fasteners.