This is a fully adjustable, black serrated rear sight compatible with Sig Sauer P220, P225, P226, P228 models. This sight uses the original Sig Sauer front sight and sits low profile when mounted. Additional keys are included in the package. These are LPA brand views that come from Italy, they are high quality. The rear sight is fully adjustable, for elevation and windage, so you can adjust it any way you like to correct your guns point of impact. The scope set is made of steel construction, not plastic. These sights use the original dovetails and grooves in the pistol slide. These are the best sights on the market today to improve the sighting of your pistols. Part number LPA TPU25SS07. Brought to you by Fusion.