{rainbowkey} Today

To give you the most relevant information, is the you're interested in: The residential key blank ? A DIY craft or acrylic blank ? A cryptographic term (Rainbow Table)? Let me know which one fits your needs! Rainbow Key Chain – Simplified - Emily Ley

As a blank, this item requires cutting by a professional locksmith, hardware store, or automated key-cutting kiosk before it can be used to unlock a door. {RainbowKey}

Based on the search results, "RainbowKey" most likely refers to the 191 - KW1 Rainbow Key Blank Go to product viewer dialog for this item. To give you the most relevant information, is

The key is compatible with KW1 and KW10 keyways, which are very common in standard residential door locks (e.g., Kwikset). {RainbowKey}