Hyper Tough 1/2 inch Hitch Pin & Clip, Grooved Head, Galvanized, Class I/II, Fits 1-1/4 inch Receiver - Walmart.com
Amazon.com: Grote 99460-5 Trailer Wiring Frame Clip : Automotive
Poly Spring Clip for Trailer Sprayer Boom
Trailer Clip Art at Clker.com - vector clip art online, royalty free & public domain
Big Red Trailer Hitch Pin with Clip, 5/8 in. Diameter, Fits 2 in. Receiver ATRLY1090R - The Home Depot
P&B Large Trailer Clip (70mm x 10mm) (tr41) | P&B
Amazon.com: Trailer Receiver Pin and R-Clip ½ Inch, with Red Coated Handle, for Drop Hitches, Multi Hitches, Hitch Plugs, Bike Racks, and Cargo Carriers– by Goreks : Automotive