Carbon Steel is in the color gold and is used more commonly in industrial industries due to its strength and durability. Locking-Gate- a separate mechanism or sleeve that ensures the carabiner does not accidentally open. Key-nose-carabiner does not have a notch to snag onto anything. Making clipping/unclipping simple. Captive-eye- A carabiner has two separate points to tie into, which prevents cross-loading of the gate.