No Soldering RequiredJust use a small screwdriver to open up the terminal blocks, slide in your stranded or solid-core wire, and re-tighten. ^^ DurablePure copper gold plated joints, plugging resistance and good contact. Adopts copper terminal, which has good transmission and not attenuation signal. ^^ HommizationAll signal ports are clearly named and labeled on both sides of the board for quick wiring. ^^ Widely ApplicationDB25 solderless Connector can be used for automatic control equipment, industrial control equipment, cash register, tax control machine, computer, etc. ^^ Easy to useSolderless male and female modules are detachable, no need for soldering iron and cumbersome tools, easy wiring.