The Amphenol 083-1H is a UHF connector hood — the protective shell that covers the cable termination on a UHF-style plug assembly. It carries a flange mount with four holes, designed to bolt onto a panel or chassis, and mates with a UHF panel receptacle. This is the hood only; the centre contact and insulator are separate items. The UHF interface is a standard bayonet-lock RF connector family used in two-way radio, antenna feeds, and test equipment where a rugged, quick-connect 50-Ohm connection is needed up to about 300 MHz.
The 083-1H is listed as Obsolete. That means Amphenol no longer manufactures it as a standard catalogue item.
This hood is for use with a UHF panel receptacle — the female chassis-mount half of the UHF bayonet interface. The four-hole flange pattern is the standard UHF panel mount; the hood bolts to the panel and the receptacle mounts on the opposite side. The cable side of the hood accepts the UHF plug body and centre contact assembly. If you are building a replacement cable assembly, you will need the full set: this hood, a UHF plug body, a centre contact, and an insulator — the hood alone does not complete the connector.