The Nikko Stirling MountMaster AO 4x32 3/8 Inch Rings and RCS Scope come with full metal alloy adjustment houses for greater reliability. Adjustments are 1/4 of an inch and feature a 4 plex reticle as standard. Shock tested and nitrogen filled at the factory for fog and waterproofing. Additionally comes supplied with 3/8 inch quick detachable mounts, ideal for mounting on air guns and 22 rifles. Key features include 1 inch matte black alloy body tube, multicoated lenses, 1/4 inch MOA adjustments and coin slot adjustments. Actual magnification 4. Objective diameter is 32 millimeter. Field of view at 100 yards is 32. Eye relief of 3.25 Inch.