Magnification: 4xObjective Lens Dia: 26mmLength: 135mm (5.31 inch)Weight (net): 373g (13.2 ounce， with mount)Eye Relief: 40-70mm (1.57-2.76 Inch)Field of View (@100yds): 6.33��Optics Coating: Multi CoatedFast focus at ocular lens (Diopter adjustment)Shock proof and Water ProofHigh-durability aluminum alloy in black matt body covered with fine rubber and beautiful complement30mm Ring Flip to Side Weaver Mount can fit any picatinny rail for RAS and RIS etcFree fitting involved: 30mm Flip to Side Weaver Mount and hex key etcThese sights are made for firearms and are a great investment for the money.