UniqueFire Black 3MOA Tactical Mini Compact Holographic Reflex Micro Red Dot Sight Scope (3MOA Sight Scope) Dot Size: 3 MOA Color: Black Range: 30-100m PLEASE NOTE THAT this item is fit for most of the tools,NOT ALL. Please see the size whether you need before buy it. If there is any questions, please contact us first. Dimensions: 40 mm (length) x 28 mm (width) x 35 mm (height) This tubeless-design reflex lens aperture provides a wide field of view. Suitable for rapid-firing or shooting of moving targets besides normal shooting. This red dot contains a separate switch with 3 steps for OFF, LOW BRIGHTNESS, HIGH BRIGHTNESS.