I wanted my mum to feel safer (she's 74) as she got a double euro cylinders no kite and a chain with the key at the back door. You can get the key with a coat hanger from outside through the hopper of the window to get in. There aren't many high security thumbturn euro cylinders available until I found safe with us. So easy to find the right size and value for your money. They are good quality and easy to fit and replace your old locks even my mum said that she could fit and replace the old locks by herself.