Locking Pin Options: EZ Hitches Locking Pins: (2 Pins) Adjuster pin 1-7/8" x 3/4" (inside shank) Receiver pin 3-1/2" x 5/8" (inside shank) Rapid Hitch Locking Pins: (2 Pins) Adjuster pin 4-3/8" x 5/8" (inside shank) Receiver pin 3-1/2" x 5/8" (inside shank) All Standard 2" & 2-1/2" Receivers: (1 Pin) 3-1/2" x 5/8" (inside shank) Provide 24/7 security to your trailer hitch with our Locking Pins. Each stainless steel locking pin is 99% rust resistant and includes a rubber dust cap to protect it from liquids and other grime. Over 30,000 lbs shear strength Triple ball bearing and cam-style locking mechanism Heavy-duty keys (keyed alike and reversible) Rubber dust cap protects key slot from liquids and other grime If you want to buy extra keys click HEREIf lost your keys and need to replace them click HERE Please take a picture of your keys or take note of the key number. In the case that you lose your keys, we will need the key number to get you the right set of replacement keys.