Receiver and Coupler Lock Set, Lock Type Dual Bent Pin, For Use With 5/8 in or 1/2 in Diameter Holes, Hole Diameter 1/2 in, 5/8 in, Vehicle Class I, II, III, IV, Features 360 Degrees Rotating Head, Adjust the Coupler Lock to the Desired Length, Integrated Key Slot Cover Helps Protect the Lock From Dirt, Pick Proof Square Key Design, Includes (2) Keys, Chrome Dual Bent Pin Lock, Finish Stainless Steel