378DAT Master Lock Coupler Lock,Adjustable universal Please log in to see price or purchase this item Quantity discounts available QuantityPrice SKU: MLS378DAT Qty On Cart Features Protect your trailer from theft with easy to install and remove lock. Fits 2-5/16" trailer couplers. Advance locking mechanism resists picking and pry... Features Back FeaturesProtect your trailer from theft with easy to install and remove lock. Fits 2-5/16" trailer couplers. Advance locking mechanism resists picking and prying. Resists rust and corrosion.