A key fits a storage box only when its full shape, including the head and any attached ring, fits inside the usable compartment. The Metal KeyPod lists internal dimensions separately from its outer size. Use that distinction to measure your key and leave room for the lid, rather than choosing from product photos alone.
Measure the Whole Key, Including the Head
Measure the key as an object, not just the narrow blade that turns in the lock. The head can be much wider, and a ring, sleeve or protective cap can increase the largest length, width and thickness. Use a ruler or caliper, lay the key flat, and record the maximum outside dimension in each direction.
Measure any key ring in the position it will actually occupy. A ring that folds flat on a desk may spring up when placed in a shallow compartment. If you plan to store two keys, lay them together and measure the combined envelope instead of doubling a single-key length. For wider device selection, the smart-cage buying guide covers the cage itself; this page is only about a separate key box.
Use the Internal Space, Not the Outer Size
The Metal KeyPod listing gives an inner compartment of approximately 68 × 30 × 8 mm. Its outer body is approximately 80 × 40 × 18 mm. The 80 mm outer length is not the usable key length. Begin with the smaller inner dimensions, and remember that “approximately” leaves tolerance to verify with the seller or a physical unlocked test.
Orient the key naturally in the tray and compare length to length, width to width and thickness to the usable depth. Rotating a rectangular key may help, but the head or ring can still strike the lid. A key longer than an inner dimension is not rescued by the larger outer shell measurement.
QIUI Metal KeyPod App-Controlled Key Lock Box with Timer
Metal KeyPod is the box with stated inner space of about 68 × 30 × 8 mm and a larger 80 × 40 × 18 mm outer body. It suits a key that physically clears the inner space and lid in an unlocked test; the listing does not guarantee fit for a particular cage key. See the product details and select the exact option before ordering.
Allow for Key Rings and the Closing Lid
Fit is more than being able to drop the key into an open cavity. The lid must close normally, without bending the key, compressing a ring or forcing the latch. Test with the box unlocked and its timer inactive. If closure needs pressure, treat the combination as unverified and do not start a timed lockout.
Keep sleeves, labels and bulky key chains in the measurement if you intend to store them. Removing an accessory for a measurement but leaving it attached in use gives a misleading result. If the product has a removable insert or gasket, rely on the exact model’s instructions rather than assuming that space is part of the listed dimensions.
Compare Your Measurements in a Fit Table
Copy this worksheet beside the actual key and the current Metal KeyPod listing. Use millimeters in every column; the key’s dimensions must be smaller than the usable opening with room for normal closure.
| Dimension | Metal KeyPod listed inner space | Your complete key | Unforced clearance confirmed? |
|---|---|---|---|
| Maximum length | About 68 mm | Measure blade through head/ring | Check in unlocked box |
| Maximum width | About 30 mm | Measure widest head or attachment | Check in unlocked box |
| Maximum thickness | About 8 mm | Measure stacked keys or raised ring | Close lid without force |
If all three measurements leave practical clearance and the lid closes freely during an unlocked test, the fit is plausible. If any dimension is close to the limit, ask for exact usable-space and lid-clearance details. Do not promise compatibility from a photo or a single nominal number.
QIUI ThrillCage App-Controlled E-Stim Chastity Cage
ThrillCage provides the physical-key cage example. Its app controls listed E-Stim and vibration, while the correct physical key releases the restraint; a separate KeyPod may hold that key only after the actual fit is confirmed. See the product details and select the exact option before ordering.
Pick a Box Without Guessing
The original QIUI KeyPod also stores a key and lists timed access with opening records, but its checked listing does not establish the Metal KeyPod’s inner dimensions. It is an alternative only after its own compartment has been measured for your key. Do not transfer the 68 × 30 × 8 mm figure to the original model.
ThrillCage is an example of a physical-key cage that might be paired with a separate key box. The cage and box are sold separately; verify the actual supplied key shape and any spare-key arrangement rather than assuming all QIUI keys have the same profile.
QIUI KeyPod App-Controlled Timed Chastity Key Box
The original KeyPod is worth comparing if you want its timed access or opening records, but its checked listing does not supply the metal version’s compartment measurements. Ask for its own usable dimensions before choosing it for a bulky key. See the product details and select the exact option before ordering.
A reliable fit decision uses the complete key, the box’s inner cavity and a no-force lid test while access is unrestricted. Keep a separate, workable release plan if a box is part of your setup.