For anti-theft protection, use the Tractor Supply 1-1/4 in. and 2 in. Receiver Universal Coupler Lock Kit. This coupler lock kit includes the essentials for trailer towing and storage security, all at an affordable price. In this kit, you'll receive a universal coupler lock, an adjustable brass coupler lock, a dual bent pin receiver lock and 4 keys. All the locks are keyed the same for added convenience. This coupler lock kit works best with 1-1/4 in. and 2 in. square receivers. Enjoy safer, more confident towing with help from this set. Looking for more trailer couplers and accessories? Check out Tractor Supply's Towing Program for towing parts that meet your needs today.