Custom Keychains & Keylights, Small Carabiner Key Ring - Aluminum, The Small Carabiner Key Ring is a 6mm carabiner. Perfect for Indoor and Outdoor that can clip to your backpack or be used to carry your keys. It includes a metal split key ring. This carabiner is not intended for climbing. Material: Aluminum 6mm carabiner clip Metal split key ring Multiple colors available ... #SM-2348 $0.97/each.