It seems like you're asking about door lock cylinder sizes. A "double 18mm, 19mm chabi" could refer to a door lock that requires two keys, one with an 18mm blade and another with a 19mm blade to operate. Lock cylinders come in various sizes and configurations, and the size of the key (chabi) required depends on the specific lock and its manufacturer.
If you're looking to replace a lock or get a key made, it's essential to contact a locksmith or the lock manufacturer to ensure you get the right key for your specific lock. Providing them with the brand and model of the lock, if available, can help them determine the correct key size.
