These are British style belt hooks that would be found on a typical Sea Service pistol.
There are two sizes. The 7" hook is what comes on our 1756 Pattern Sea Service Pistol with a 12" barrel, the 5" hook is for shorter barreled pistols.
They mount with the rear lock screw and keep from rotating via a pin that sticks out of the mounting foot. These can adapted to fit most pistols with wooden stocks. They are made of hand forged steel.
We ship small non-gun items like this generally once a week so as to ship all of the USPS stuff together. It may be a week or so before you recieve your belt hook, depending on what day of the week before you order it. For reasons I don't understand, people who order just a belt hook tend to be squirrely and expect to be given priority over our other customers. Please do not get all squirrely and send me emails checking on the status of your order for a belt hook if you haven't received it in two days. You will get a USPS tracking number when your belt hook ships. It is the ONLY notification you will get.