Nikon 16166 A-Series Ring Set Low 1" Dia Aluminum Black Matte Make sure your optic is securely and perfectly mounted with the Nikon A-Series Scope Rings. These rings are made of durable aluminum alloy with a black matte finish, meaning they will last the life of your rifle. They are securely mounted to your rifle as they are clamped together locking in your scope. Type: Ring Set Height: Low Tube Diameter: 1" Finish: Black Matte Style: Vertically Split Material: Aluminum