Tow center circle with 0.5 MIL width and crosshair with vertical and horizontal hashes.
One of the circle of the diameter is 6 MIL, the other one is 25 MIL.
The crosshair width is 1/6 MIL in inside the 6 MIL circle, and 1/16 MIL in outside.
These hashes are placed in 1 MIL increment between center-10MIL. Also available in illuminated model.