5 x UHF-MALE (PL259) connector is Nickel plated, Silver-Plated center pin, Bakelite insulation and heavy duty knurling. Connector is 1.56" long with a .72" dia. A nice low-cost hi-Quality general purpose connector for use on small and medium size coaxial cables .199" to .432" outer diameter. Common for most of the larger 50 ohm cable such as LMR-400, RG8, RG213, RG214 and others. Connector is Nickel-Plated, and Bakelite phenolic insulator. It DOES NOT MELT when over-heated.