This keychain uses a carabiner.
It comes with 4 double rings.
Available in sizes XS, S, M, L, and XL.
This is a L size.
Carabiner (nickel): Length: 3.1 inches (80 mm).
Shackle (stainless steel)
Double Ring (Silver) / Iron
Size: Diameter 0.8 inches (20 mm), Hole Inner Diameter 0.7 inches (1
Please regularly tighten the screws.