Specifications:
 3 aperture interchangeable: 0,8; 1,0; 1,3 mm  and one fixed 4.8 mm
sight hight from rail to centre aperture: min 38mm - max 44mm
horizontal adjustment range: 6 mm  (100 clicks)
vertical adjustment range: 65 clicks
length:70 mm
weight: 127 grams / 4.5 oz
material : Turable aluminium and stainless steel parts 
best compatibility paired with a Nord Arms front sight: NA-IS-FS
 
Our rear sight is strong and with wide adjustment range:
one click horizontally equals 0.06 mm / 0.00236"
one click vertically equals 0.05 mm / 0.002"
 
For example, this allows you to adjust impact point @ 100 meters by 9.7mm horizontally and 8mm vertically, if the distance between sights is 50 cm / 20".