Here's another model in my line of EDC keychain retension systems. These pieces are made from Pure Copper and Brass with brass recessed flat head screws and hand ground bevels. They are designed to hang securely from any beltloop up to 5/8" wide. The mushroom shaped void makes it very hard for these to come loose unless you hook your thumb under the belt loop and lift a little before removing. You'll be good at it in no time!
The Spartan consists of one core and one scale, and can be carried left side but is designed for right side carry.