The Blaylock TL-33 Universal Coupler Receiver Lock is intended for commercial and recreational use. It fits over 30 different coupler styles and brands and fits over 2" to 2-5/16" couplers. Some compatible brands include: Buyer's, Atwood, Fulton, U-Haul, Pro-Series, Titan, Demco and more. Features a custom fit 3 pin placement for easy fit. The patented design ensures the most secure way to leave an unattended trailer. Solid hardened steel lock rod and high grade aircraft aluminum provides security.