SMC’s Large Steel Locking ‘D’ Carabiner was developed especially for the needs of the fire and rescue community, with a large gate opening that easily fits over litter rails. The sleeve locks on the gate rather than the body of the carabiner, eliminating problems of the knob binding on the frame after the carabiner has been loaded. This carabiner is included with the system for attaching the stretcher to a hoisting system.