Ultra Safe Lock Core Design:Our trailer hitch coupler lock can control the coupling with keys to prevent others from pulling out the receiver/coupling and the hitch ball tongue lock can protect your trailer from being pulled apart by other vehicles Bold Color More Effecitve Anti Theft:The appearance of the trailer tongue lock is designed in red make most people notice anti theft. Compared to other products,the trailer hitch coupler locks requires one turn of the key to open is safer than only half a turn Excellent Material:The boat trailer hitch lock is made of heavy-duty steel and superior quality aluminum,High quality materials make it difficult for thieves to break.The trailer couple lock can effectively prevent rust and corrosion, greatly extending its service life and effectively prev.