Eight inserts for Nord Arms Front Sight.
 
Insert characteristics (from up to down by columns)
 
A1) Crosshair with thick lines
crosshair aperture - 3.0 mm 
lower pole width - 1.0 mm 
 
A2) Crosshair with thin lines
crosshair aperture - 2.0 mm 
lower pole width - 0.6 mm 
 
A3) Crosshair with thin lines and stepped thick post
crosshair aperture - 1.8 mm 
lower pole width - 0.9 mm
 
A4) Crosshair with thin lines and stepped thick post
crosshair aperture - 1.1 mm
lower pole width - 0.65 mm
 
B1) Stepped pole
pole tip width - 0.7 mm 
 
B2) Stepped pole
pole tip width - 0.9 mm
 
B3) Stepped pole
pole tip width - 1.3 mm
 
B4) Straight pole
pole tip width - 1.5 mm