CVLIFE Tactical 3-9x40 Optics R4 Reticle Crosshair Air Sniper Hunting Rifle Scope with Free Mounts Specification: 3-9x40 Magnification: 3-9x Objective Diameter: 1.57" (40mm) Exit pupil: 0.2"-0.67" Length: 12.20" Magnification: 3-9x Objective Diameter: 1.57&#034; (40mm) Exit pupil: 0.2&#034;-0.67&#034; (5.1mm-16.9mm) Length: 12.20&#034;(31cm) Weight: 0.76lb.(345g) Tube diameter: 1&#034; (25.4mm) Free Offer Rail Mounts: 0.79&#034;(20mm) Mount ring dia. 1&#034; (25.4mm) The scope includes a Special inner and outer structure to control the interaction between the inner and outer tubes of the scope, which provides long lasting reliability in these interaction and ensures the reticle would not rotate when adjusting. This smart design makes the scope shockproof and provides more precise windage and elevation adjustment. Built on an ultra strong 1 inch machined-aluminum tube. Completely sealed and 100% nitrogen filled makes it fog and rain proof. This tactical scope could be used under any weather condition. Fully multicoated glass provides over 90% light transmission, brilliant images and exceptional color contrast. Scratch-resistant coating protects exterior lenses from scratches, oil and dirt 1 x 3-9x40 Rifle Scope 1 x Lens Cover 1 x Allen Key 2 x Scope Mounts for 20mm Rail