CURT hitch locks allow you to lock your ball mount into your trailer hitch, deterring theft and helping prevent anyone from detaching your trailer at the ball mount. 5/8" diameter pin fits 2" x 2" receiver tubes Carbon steel construction protected by a durable chrome-plated finish Easy-to-operate, 1/4-turn lock activation Watertight dust cap helps prevent internal corrosion Includes two keys for added convenience