This is a “drop-in ready” stainless steel guide rod assembly for a Smith and Wesson Shield 45 acp pistol, made out of solid 304 stainless steel. The rod is made of only the finest stainless steel materials to replace the factory guide rod assembly that comes in your Smith and Wesson Shield 45 acp pistol. Our rods are measured to factory specification and we ensure the finest fit and finish on all of our components. This is a great upgrade for reliability and durability, from the factory guide rod assembly that comes in your Smith and Wesson Shield pistol . Our stainless steel guide rod assembly will fit the 45 caliber Smith and Wesson Shield pistols. Our solid, one piece, 304 stainless steel guide rod is rigid and will not flex or bend like the factory two piece version. Also, this rod WILL fit the performance center model.