【Overview】 These are conversion connectors that allow for wiring without soldering, converting between DC jacks and screw terminals, and DC plugs and screw terminals. They have polarity indicators for +/–. They are convenient for test wiring and temporary assembly of LED strips, surveillance cameras, and various DC devices. 【Set Contents】 ・DC plug (male) → Screw terminal ×2 ・DC jack (female) → Screw terminal ×2 【Specifications】 ・Plug/Jack: Outer diameter 5.5mm / Inner diameter 2.1mm (common size) ・Terminals: +/– polarity indicated, negative (–) side is the outer part, not the core ・Tools: Can be tightened with a small screwdriver (no soldering required) 【Condition】 Unused. 【Notes】 ・Size is 5.5 x 2.1mm (not 2.5mm or mini type) ・Always check the polarity before connecting ・Not suitable for high-current applications. Please use for low-power prototyping and wiring ・Will be shipped in simple packaging. Power supplies and cables are not included If you have any questions, please ask in the comments. Pre-purchase inquiries are welcome.