This is a rear fully adjustable sight, white outline, for the Sig Sauer models P220, P225, P226, P228. This sight uses the original Sig Sauer stock front sight and sits low profile when mounted. Additional wrenches are included in the package. These are top quality LPA brand sights made in Italy. The rear sight is fully adjustable, for elevation and windage, so you may adjust it in any way for your liking to correct your pistols point of impact. The sight set is made of steel construction, not plastic. These sights use the original dovetails/slots on the pistol slide. These are the best sights on the market today to improve your pistols sighting. Will not work on Novak dovetails. Wil not work on Sig Mosquito.