Specifications:
dual aperture: 1 mm / 0.039" and 4.8 mm / 0.189"
horizontal adjustment range: 6 mm / 0.236" (80 clicks)
vertical adjustment range: 3 mm / 0.118" (60 clicks)
length: 69 mm / 2.43"
weight: 127 grams / 4.5 oz
 
Our rear sight is strong and with wide adjustment range:
one click horizontally equals 0.075 mm / 0.003"
one click vertically equals 0.05 mm / 0.002"
 
For example, this allows you to adjust impact point @ 100 meters by 1.5 mm / 0.06" horizontally and 1 mm / 0.04" vertically, if the distance between sights is 50 cm / 20".