Features a threaded screw pin that tightens securely to lock the D-ring, preventing accidental opening during heavy loads or vibrations. Ideal for safety-critical applications,Constructed from 304 stainless steel for maximum strength, corrosion resistance, and durability in saltwater, rain, or harsh environments,Use of connection accessories, apply to a variety of boat or household applications, could be also used in loading and unloading of goods, mining equipment, forestry machinery, land transportation, hoisting machinery and etc