it looks like each word can only be four letters/tiles long???? what if your words are longer?

Unlike some of the reviewers that don't understand how seed phrases work, the seed phrase protocol ensures that the first four letters of any word in the library is unique. So for example, if a word in your seed phrase is "short", there will never be any word in the library that begins with those same four letters , "S-H-O-R". So, "shore", or any other word beginning with those four letters would not exist in the library. If you've ever tried recovering a wallet using a seed phrase, you'll find that you'll usually choose each of the 24 words in order from a list of choices, making it so you don't even have to remember what the abbreviations mean, simply match them up when stepping through the recovery process. Whatever you do, DO NOT do what some of the reviewers have done and arbitrarily create your own abbreviations. ONLY use the first four letters.

Another person asked if letters were etched. answer sidestepped that the tiles are also ss. are the letters etched? paint won’t survive fire.

The letters are etched on the metal tiles that are crafted from 304-grade stainless steel. Since this has a fireproof threshold ranging from 2550 to 2650 degrees Fahrenheit, your recovery seeds will be safe within.

How many seed phrases does it store?

It can store 24 words. Thanks for asking!

What is the diameter of the hole in millimeters?

The diameter of the hole is 6 mm.

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Keystone - Indestructible Steel Crypto Cold Storage Seed Backup, Compatible with All BIP39 Hardware & Software Wallets, Ledger, Trezor, KeepKey, Coldcard, Supports up to 24 Words (Keystone Tablet)

Keystone - Indestructible Steel Crypto Cold Storage Seed Backup, Compatible with All BIP39 Hardware & Software Wallets, Ledger, Trezor, KeepKey, Coldcard, Supports up to 24 Words (Keystone Tablet)

Product ID: 145284979

Details

Brand
Cobo Vault
Product Dimensions
2.36"D x x
Lock Type
Combination
Color
Keystone
Material
Stainless
Special Feature
Fireproof

🔐Supports 24-word BIP39 seeds - Universal crypto backup

🔥Fireproof up to 1455°C - Survives house fires

🛡️Grade 304 Steel - Indestructible strength

Description

🛡️ Fortify your crypto future with the indestructible Keystone Tablet!

FIREPROOF FORTRESS - Withstands extreme heat up to 1455°C, far beyond typical house fire temperatures—your crypto’s last line of defense.
COMPLETE SECURITY KIT - Includes 252 laser-engraved letter tiles, anti-tampering stickers, screws, screwdriver, and a detailed guide—everything you need to lock down your crypto legacy.
UNBREAKABLE CRYPTO ARMOR - Crafted from corrosion-resistant grade 304 steel to safeguard your seed phrase against any disaster.
SLEEK POCKET READY DESIGN - Slightly larger than a credit card, it’s ultra-portable and discreet for on-the-go peace of mind.
UNIVERSAL WALLET COMPATIBILITY - Seamlessly supports all BIP39 hardware and software wallets including Ledger, Trezor, and MetaMask.

The Keystone Tablet is a premium-grade 304 stainless steel crypto seed backup designed to protect your 12, 18, or 24-word BIP39 seed phrase from fire, corrosion, and physical damage. Compatible with all major hardware and software wallets, it offers a compact, portable design with laser-engraved, anti-tamper letter tiles and a secure locking mechanism, ensuring your crypto assets remain safe for decades.

Specifications

ASIN	B07RZW8CWY
Additional Features	Fireproof, Portable
Best Sellers Rank	#628,226 in Electronics ( See Top 100 in Electronics )
Brand	Cobo Vault
Brand Name	Cobo Vault
Chamber Depth	2.36 inches
Color	Keystone Tablet
Control Type	Key Control
Customer Reviews	4.4 out of 5 stars 799 Reviews
Included Components	Screw
Item Dimensions D x W x H	2.36"D x 4.13"W x 0.28"H
Item Weight	14.4 ounces
Lock Type	Combination
Manufacturer	Cobo Vault
Manufacturer Part Number	6971788330020
Material	Stainless Steel
Material Type	Stainless Steel
Model Number	CV001
Mounting Type	Wall Mount
Number of Items	1
Product Dimensions	2.36"D x 4.13"W x 0.28"H
Special Feature	Fireproof, Portable
UPC	697178833044
Unit Count	1 Count
Water Resistance Level	Not Water Resistant

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