HEAVY-DUTY: 5/8in threaded pin fits 2in hitch receivers tow ratings up to Class IV (12,000 lbs max); REQUIRES HOLLOW SHANK tube tow equipment (not solid) SILENT TOWING: Eliminates distracting hitch clanking, load sway, and absorbs shock loads STATE-OF-THE-ART: 90-degree lock design swivels for user-friendly, no fumble access win tight hitch spaces; made with corrosion resistant chrome, stainless and hot dip zinc components EASY TO USE: Snap-On lock secures onto pin without key engagement; includes two rubber capped keys ANTI-CORROSION: Heavy-duty lock with nylon jacket and rubber dust core for easy grip and corrosion protection from exterior and interior