The 379ATPY features a universal trailer coupler lock, designed to fit 1-7/8in, 2in, and most 2-5/16in couplers. The advanced locking mechanism provides resistance to picking and prying. • Universal trailer coupler lock fits 1-7/8in, 2in and most 2-5/16in couplers • Rekeyable cylinder for keyed alike convenience • Advance locking mechanism resists picking and prying • Easy to install and remove • Resists rust and corrosion