The SMC LARGE STEEL LOCK D CARABINER NFPA is developed by SMC especially for the needs of the fire and rescue communities. Available in several different metal finishes, as well as in both NFPA (Class G) and non-NFPA versions. Black zinc coated models are ideal for tactical operations and stainless-steel model is best for corrosive environments. Large gate opening fits easily over litter rails. All models have stainless gates and locking sleeves for greater strength and reliability.