These are screw type height raisers for your Air Rifle's sight and are made of stainless steel. They come in set of 4, 2 for the for the foresight and 2 for the rear sight. Make sure you have a screw type option in your sight plate. You can always consult with us for any doubts. Mostly used in Walther Air Rifles for 10 m Air Rifle Shooting.