Trailer Lock Combo Set, Receiver Lock & Trailer Coupler Latch Lock, Coupler Lock Fits 1-7/8" 48 mm, 2" 51 mm & Most 2-5/16" 59 mm Couplers, Receiver Lock Includes The Push To Lock Locking Mechanism, Easily Used By Pushing The Lock Body Firmly Onto The Pin & Removing The Key, Fits Both 1/2" 13 mm & 5/8" 16 mm Receivers, Latch Lock Adjusts From 9/16" 14 mm To2-3" 70 mm For Added Application Flexibility, Keyed Alike, Coupler Lock Fits 1-7/8" 48 mm, 2" 51 mm & Most 2-5/16" 59 mm Couplers, Push To Lock Receiver Lock Fits Both 1/2" 13 mm & 5/8" 16 mm Receivers, Latch Lock Fits Most Couplers & Is Adjustable With 6 Locking Positions From 9/16" 14 mm To 2-3/4" 70 mm.