Tritium Vials 2x6, 2x12 and 3x11: Which Size Fits Your Glow Fob?
By Quality EDC with Innovative Designs | Published: 2026-11-04
Category: Nákupní průvodci
Compare 2x6, 2x12, and 3x11 tritium vials for glow fobs. Learn how length and diameter affect fit, brightness, and carry so you pick the right size the first time.
Quick answer
Choose the 2x6 when your fob has a short, narrow slot and you want the least bulk; choose the 2x12 when you want maximum glow length in a slim channel; choose the 3x11 when your fob is drilled for a thicker vial and you prefer a brighter, more robust feel. Always confirm your fob's internal dimensions before ordering.
Why length and diameter matter more than color
Tritium vial sizes are written as diameter x length in millimeters. The first number controls whether the vial physically enters your fob's channel; the second controls how much glowing surface you see. A vial that is too fat will not seat, and one that is too long can protrude or rattle. Color and brightness are secondary until the physical fit is correct.
This is why a tritium vial size chart is only a starting point: two fobs with the same outer footprint can have different internal bore sizes. Measure the opening and depth of your fob, not just its exterior.
The trade-off between glow length and carry comfort
Longer vials such as the 2x12 put more light along the fob, which helps you spot it on a dark keyring. The cost is a longer, more conspicuous profile that can catch on pockets or sit awkwardly in a small pouch. Shorter vials like the 2x6 disappear into compact fobs but produce a smaller glow point.
Thicker vials like the 3x11 generally feel more substantial in hand, but they require a fob designed for that bore. If your fob was drilled for a 2 mm vial, a 3 mm vial is not an upgrade—it is a mismatch.
When the catalog does not list your fob's bore size
Many glow fobs are sold without a stated internal diameter, and tritium vial listings cannot know every host. Treat that absence as a measurement task, not a guess. Use calipers or a drill-bit gauge to check the channel, and compare against the vial's stated dimensions before purchase.
If you cannot measure, choose the smaller diameter vial and a shorter length; a slightly loose vial can often be secured with adhesive, while an oversized one cannot be made to fit.
Decision rules for picking your vial size
- Measure the fob channel first: Use calipers to record the internal diameter and usable depth. If the diameter is 2 mm and the depth is about 6 mm, choose the 2x6; if the depth is about 12 mm, choose the 2x12. If the diameter is 3 mm and the depth is about 11 mm, choose the 3x11. Write the measurements down before you open the product page.
- Match diameter before length: Never size up the diameter to get more glow. A 3x11 will not fit a 2 mm channel, but a 2x12 will fit any 2 mm channel that is long enough. If your fob accepts 2 mm vials, stay with 2x6 or 2x12. Diameter is a hard limit; length is a preference within that limit.
- Choose length by carry style: For a fob that lives in a coin pocket or on a tight keyring, pick the 2x6 to minimize snagging. For a fob that hangs freely or sits in a pouch, the 2x12 gives more visible glow. Choose the 3x11 only when the fob is built for a 3 mm bore and you want a thicker feel. If you are between two lengths, the shorter vial is the safer everyday carry.
- Account for installation: The product page notes that free installation service and installation-order options are not visible in the shop app; tap the Visit Ant Design button to switch to the website if you need those services. Otherwise, plan to secure the vial yourself with a compatible adhesive. Decide on installation help before checkout, not after the vial arrives.
Product facts
- Tritium Vials 2x6 2x12 3x11: Available in 2x6, 2x12, and 3x11 sizes with color options, and priced per single unit. You can order the exact diameter and length your fob needs without buying a multi-pack of sizes you will not use.
Tritium Vials 2x6 2x12 3x11
Who should choose which size
Best for
- Owners of compact glow fobs with a 2 mm x 6 mm channel who want minimal bulk
- Users with slim, long channels who want maximum glow length from a 2x12 vial
- Carriers of fobs drilled for a 3 mm bore who prefer a thicker, more substantial vial
Not for
- Anyone who has not measured the fob's internal diameter or depth
- Fobs with a channel shorter than the vial length you are considering
- Buyers who need installation service but have not switched to the website to request it
