The Leupold Rifleman scope mounts are precision-machined from aircraft-grade aluminum to provide the necessary strength and recoil resistance without adding excess weight to the rifle. The 2-Piece design offers more mounting flexibility and accessibility to the breech of your rifle. Bases will work with any Weaver-Style rings. – Note: This is specifically for the Savage 10/110 with a round receiver and 8-40 screws