2 Pack, 58, 16 mm, Class IIIIV, Barbell Pin Receiver Lock, Keyed Alike, Includes The Push To Lock Locking Mechanism, Easily Used By Pushing The Lock Body Firmly Onto The Pin Removing The Key, Weather Tough Seal Water Tight Cap Provides Additional Protection From Moisture Dirt, Fits 58, 16mm Receivers, Usable Length Of Receiver Pin Is 234, 70 mm, 10,000 LB Load Rating, 4 Pin Cylinder For Added Pick Resistance, Uses Master Lock Key Blank K1BOX Or Ilco Blank M1 TV 320952, Not Included