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NBJINGYI straight couplers are perfect for safe towing of ball size 2 inch and channel 3 inch trailers ,3500 LBS load capacity.The easy-to-use quick-release latch makes for a fast and secure hookup to your hitch setup. Zinc finish on thick durable die-cut steel for rust and corrosion resistance fit all weather conditions and heavy usage, typically used for heavy usage products and will last for many years. Our Company Promise We are devoted to a complete line of products using cutting edge technology with the expertise and ingenuity to produce superior products that are durable and dependable . We always develop and apply the newest advancements in technology to provide customers with quality products without the high price