Let’s Go Aero’s enhanced Silent Hitch Pin® technology moves Safe and Silent Towing® to the next level with state-of-the-art design enhancements that keep your hitch accessory on secure lock down and with greater convenience than ever before. The Silent Hitch Pin’s heavy-duty steel coiled spring nut holds the nut tight in the tow accessory shank and is portable to fit with any hollow 2-inch ball mount, cargo carrier, bike rack, or hitch step. When properly engaged with the threaded pin, the result is a highly secure and stable, distraction-free towing experience . Requires HOLLOW tubed hitch accessory devices, shank tube cannot be solid Requires hollow shank tube tow equipment Heavy-duty 90-degree lock with nylon jacket and rubber dust cover for great accessibility in tight hitch spaces, easy to grip and press-on engagement, and corrosion protection to exterior and interior . Includes two rubber capped stainless steel keys Can be used with 2.5in-to-2in hitch reducer adapters RV approved Let's Go Aero patent protected