ITEM NAME:5.5 x 2.1mm 3A 12VDC Power Adapter Connectors Female Socket Power Supply Po S8Q9 5.5 x 2.1mm 3A 12VDC Power Adapter Connectors Female Socket Power Supply Po S8Q9 Metal panel installation plastic / metal 2.1mm x 5.5mm DC socket! 2 Terminal type positive and negative Installation hole of 7.8 mm required. Complete with rear mounting nut. It will take pressure on 3.2 mm fittings or solder to fit. Requires total play behind the cover of 13 mm Color: Black Material: Copper Switching capacity: MAX 3A 12V DC Connector size: 2.1 mm x 5.5 mm x 9 mm Product size: 10mm x 10mm x 18mm Max installation depth: 3 mm Package Included:1 x DC Power Supply Female Panel Mount Connector Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.