This stylish, yet functional, key organizer is designed to be used with any standard keys. With a maximum 18mm stack thickness, it's perfect for keeping your extensive car and house key collection in one place. Fits keys with a maximum length of 70mm, and a minimum hole diameter of 3.5mm. Far more compact and less bulky than standard keyrings, this key organizer keeps your keys tucked in and secure. It even comes with a metal ring at the end to attach to keyrings.