Cocoweb [New] C-Lock Heavy Duty Locking 1/2 Inch Hitch Pin;

A New Standard in Design
The C-Lock has an industry-standard 1/2" diameter that's designed to fit almost all Class I, II, III, and IV trailer hitches. Locking down your trailer is as easy as sliding the pin into place; a heavy-duty lock keeps it from accidentally sliding out as well as deterring theft. A protective cap also keeps out water and grime, weatherproofing the locking hitch pin for years of reliable, rust-free use in any environment. Two duplicate keys are included for added convenience.

Pins down the Competition
In comparison to the competition, the C-Lock serves more hitches and comes in at a fraction of the price, not to mention it also includes a manufacturers 1-year warranty.