This is a decorative key blank for use with stealth locks similar to the Holy Trainer Lock, HappyGo Lock, or Burg Wachter. This design is made to be compatible with most locks, and it thus a thinner body than the genuine Burg-Wachter keys. The shaft of the key (thickest part inserted into the lock) is 1.9mm wide, and the cut portion of the blade is 0.9mm thick.
A local locksmith would need to duplicate your existing key onto this blank - ask if they have a "slot cutter machine" for duplicating - it's an older style machine. Newer machines with computer controls and code cutting won't do this.
Purchasing this item and having it work with your lock is a DIY project - When I first designed the key, I called and visited six or seven local locksmiths in order to find one who could perform the work. The locksmith indicated the machine was a slot cutting machine. The cost and time I put into getting the key cut, tested and re-shipped out really added to the bottom line cost of the item, which was why I offer it as a blank for those who want to give it a go themselves.
There is
a VERY good tutorial a customer put together on finishing the key, including how to file the lock pattern yourself at Chastity Mansion