Here we have a stainless steel flush design 1-1/4 inch trailer hitch receiver lock from DeadBolt, part number 40106. Included with the lock are two keys and a rubber cover that goes over the end to help keep moisture out. The lock is made of stainless steel here in the USA. The hitch pin has a diameter of 1/2 inch and an inside width of 1-5/8 inches. It utilizes a patented pick-proof screw lock design. You will use the key to release the lock, but you will need to keep turning it as it threads on to the hitch pin to help resist against lock picking. And that does it for DeadBolts stainless steel flush design 1-1/4 inch trailer hitch receiver lock, part number 40106.