1/2-13 x 2 3/4 STRONG-BOLT® 2 Cracked and Uncracked Concrete Wedge Anchor Mechanically Galvanized - Box (25) wedge-type expansion anchor in a mechanically galvanized finish can be used where a high-load-resisting anchor is needed for exterior applications. It has the same dual undercutting embossments on each clip segment as the zinc-electroplated version. Suitable for horizontal, vertical and overhead applications, the STB2-MG anchor is tested in uncracked concrete in accordance with AC193 and also in uncracked masonry in accordance with AC01.