Fulton Gorilla Guard Trailer Coupler LockThe Fulton Gorilla Guard coupler lock prevents theft and keeps your trailer secure. It features a tamper-resistant design to keep unattended trailers secure. Gorilla Guard is an easy to use, push-button lock. Heavy-duty cast construction with die-cast steel barrel keys ensures long lasting durability. Design shields lock from tampering devices; 1 Year limited warranty; Specifications:63227 Fits most 2-5/16" trailer couplers.; Good for up to 4-1/8" wide trailer coupler width (including lip).; Height of coupler lip cannot be greater than 5/16"; 63228 Fits Most 2" trailer couplers.; Coupler width (including lip) cannot exceed 3-13/16"; Height of coupler lip cannot be greater than 5/16"; Please measure your width prior to ordering.