BNC (Bayonet Neill–Concelman) male coaxial connectors or protective caps/terminators with a metal housing and a knurled locking ring.
OverviewType: RF/Coaxial Connector (likely a BNC male plug, cap, or terminator variant)
Material: Metal (commonly nickel-plated brass or stainless steel)
Common Uses: CCTV systems, radio frequency equipment, laboratory testing instruments, and telecommunications