Excellent choice for air rifles. Features variable magnification from 4 to 16 times and an objective lens diameter of 44mm, offering a clear image and a wide field of view. Specifications: Magnification: 4-16x Target type: MilDot MOA Objective lens diameter: 44mm Shockproof, fog proof, waterproof Diopter rings 30 mm Total length: 340mm Tube diameter: 25.4/1 mm Waterproof rating: IPX4 Includes rails and base for easy mounting on your weapon.