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 / 0.1181" = 30/254"
lower pole width - 1.0 mm / 0.0394" = 10/254"
 
A2) Crosshair with thin lines
crosshair aperture - 2.0 mm / 0.0787" = 20/254"
lower pole width - 0.6 mm / 0.0236" = 10/254"
 
A3) Crosshair with thin lines and stepped thick post
crosshair aperture - 1.8 mm / 0.0709" = 18/254"
lower pole width - 0.9 mm / 0.0354" = 9/254"
 
A4) Gradual post with round tip
round tip diameter - 0.6 mm / 0.0236" = 6/254"
 
B1) Stepped pole
pole tip width - 0.7 mm / 0.0276" = 7/254"
 
B2) Stepped pole
pole tip width 0.9 mm / 0.0354" = 9/254"
 
B3) Stepped pole
pole tip width 1.3 mm / 0.0512" = 13/254"
 
B4) Straight pole
pole tip width 1.5 mm / 0.0591" = 15/254"