"What's better than 1 lock? 2 locks! Amp up your trailer's thief-stopping security with the bROK Receiver and Coupler Lock Kit. This easy-to-use trailer accessory locks your coupler handle, and it locks your ball mount inside your trailer's receiver. The sleeve shank works with class I-IV receivers. This trailer accessory even has a rubber key-hole cover that keeps dirt and debris out. The main shank of the bROK Receiver and Coupler Lock Kit is built with solid steel and chrome plating for years of reliable service and protection. Sleeved shank enables operation as a 1"" and 5/8"" shank and the kit works with receiver boxes up to 2"". Locks receiver handle and secures ball mount inside the trailer receiver Works with class I-IV receivers Shank is built with solid steel and chrome plating Rubber key-hole cover keeps dirt out Sleeved shank enables operation as a 1"" and 5/8"" shank Works with receiver boxes up to 2"""