HooAMI Silver Tone Stainless Steel Spring Loaded Gate Locking Hook Chain Carabiner 0.78" Dia Material:Stainless Steel Features:Never fade, Nondeformable, Anti-allergy Outside diameter:20mm( 6/8");Inner diameter:14mm( 4/8");Thickness:4mm; Main Color:Dull Silver Tone With a spring loaded gate, can attach to a wide range of fixing points quickly and securely