In response to an email I received from Wazoo after my last review, I decided to test my key. I used it several times on the handcuffs and had no problem with the key. I then tried to use the key with the handcuffs on me to try and escape. The cuffs I used are the ones with three links attached at three points, so there is very little room between the braclets. My hands are small and I was able to escape with either the Wazoo key or the cuff key. My husband and son have large hands and are completely unable to reach the key hole with either key. This was with hands in front of us. It may be different with the type of cuffs that have a chain between them. We don't have access to a pair of those to test.