This riflescope has main tube diameter 30mm and overall diameter of the objective bell is 40mm.

• Edge-to-Edge Image, Return to Zero Adjustment Plate, 4in Long Eye Relief, 1/4MOA Adjustment

• FMC, Designed for 30 to 300 Yards Shooting, 30mm Monotube, FD7 Style Etched Glass Reticle

• Magnification: 2-10x
• Objective Lens Dia: 40mm
• Ocular Lens Dia: 33mm
• Ocular Lens Length: 80mm
• Exit Pupil: 20-4.0mm
• Optics Coating: Fully-multi coated
• Field of View: 41.9-10.47 feet @ 100 yards
• Eye Relief: 100-90mm (4.0-3.5in)
• Length: 340mm (13.4in)
• Weight: 500g (17.6oz)
• Tube Dia.:30mm Monotube
• Click Value: 1/4 MOA
• Elevation Range: 60 MOA
• Windage Range: 60 MOA
• Parallax Setting: 100 yards
• Reticle: Etched glass VFD-2
• Illumination: 11 levels red
• Battery Type: CR2032
• Number of Lens: 12 pcs
• Shock tested to 750g, water resistant
• Fully nitrogen purged to eliminate any fogging of the lenses internally
• Adjust plate is NOT fixed, after zero the scope you can turn the plate to zero
• High quality 6061 T6 aircraft grade aluminum
• Designed for close and mi-range shooting
• Diopter compensation from fast-focus eyepiece (+2 to -2)
• Including items: one pair of 30mm weaver scope rings, lens cap, packaged in nice retail box