Stainless Steel 316 Marine Grade Carabiner $9.00 – $10.00 Stainless Steel 316 Marine Grade Carabiner This stainless steel 316 marine grade carabiner is the perfect carabiner for all your rigging needs. The marine-grade carabiner is corrosion and rust-resistant and has a long service life even while using it in salty seawater. The Stainless steel 316 carabiner with a smooth finish can be used to connect all your freediving gear safely and conveniently.