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This lantern is in beta! If you order it I would appreciate any information on fixing it! This tritium Lantern holder was designed for a friend and will hold lanterns (encased in a glass tube) that fit the dimensions 1 1/8" long (roughly 28-29 mm) and 1/4" diameter (6-7 mm). you will need an o-ring to keep the lantern in the holder or you will have to glue it in place. alternatively, if you are worried about the radiation from tritium, you can purchase some Strontium aluminate powder and a couple of those glass tube fuses and fill the tubes with the powder for a similar glow effect sans the radiation!