BOTAO Excellent item for small electronics projects and CCTV applications. Perfect for making a cable to the desired length or replacing a broken connector. Dimensions: plug outer diameter 4.0mm, inner diameter 1.7mm Size judgment skills: when you don't know not your plug size, you can use a vernier caliper to cut the original old plug, or use a ruler to measure the plug size near our store, then you should find it. Scope of application: DC and AC power transformers, switching power supplies, adapters, etc. Delivery Quantity: 10pcs, Package Contents: Only the above package contents, excluding other products. Size: The outer diameter of the plug is 4.0 mm and the inner diameter is 1.7 mm. It is suitable for various power sources such as DC and AC power transformers, switching power supplies, and adapters. (Reminder: The size is measured manually, please allow 1-2 cm measurement error) Colour: Black (Due to different monitors and lighting effects, the actual color of the item may be slightly different from the color shown on the picture.)