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This is a 3D printed version of my very popular Pocket Pawns.
This is designed to fit a 3mm X 25mm tritium vial which you will have to purchase seperately. The vial can be secured in the pawn with a small amount of epoxy or silicone caulk applied to the top of the hole.
The vial hole may need cleaner up with a 1/8 inch drill bit prior to installing the vial.