My extra large titanium key rings can be used to attach to the webbing of any bag. A small slot is cut on the ti ring which allows it to be threaded onto the webbing or the strap of a bag. Once mounted to a strap, the ring will remain on the strap securely. I have one mounted on the bag I use and it allows me to easily attach and remove my keys with one hand without having to look back. I have some customers who attach these directly to the straps of shorts or pants to use them as an attachment point for keys and other items.Dimensions - OD: 60mm, ID: 50mm 5mm thick. Approximately 7mm wide.