You may have to carefully poke a hole in the key to get it large enough, but most keys will fit just fine. I have a fairly complete workshop, but I must warn you that drilling a hole in a key can be a little dangerous. Unless you're very good with tools, stick to a keycap to hold keys with holes big enough to attach a stem to an elastic cord. Rather than a metal pin or screw like many key organizers, the keyhole has an elastic cord that attaches to a metal rod (requires a minimum 7/32" diameter hole. Not sure how strong the cord is). . , but time will tell. I carefully ground the holes on each key so as not to cut the cord. If the cord is strong then the key case is a very compact way to carry up to 8 keys without practically protruding in your pocket.
Stainless Steel Husband Keychain with Stamped Relatives for Enhanced SEO
31 Review
Titanium Keyring by BANG TI: Easy-to-Use Operation for Ultimate Convenience!
50 Review
Carry Your Love For Firefly Everywhere With QMx'S High-Quality HD Key Chain
34 Review
Premium Handmade Warranty Men's Keyrings & Keychains by Hide Drink Accessories
45 Review