IZTOSS 12-24V Cigarette Lighter Socket 5v 3.1A Dual USB Adapter for Motorbike Auto RV Boat The panel is 4.15 x1.67x0.21 inches,include 4x Screws,4x Insulated Terminals,15cm short wires Each plug comes with a splash proof plug to seal the socket preventing water or sand from entering the empty jack. Input: DC12V-24V. Barrel inner diameter:2.1cm/0.83",Barrel inner length:3.6cm/1.42" There are star nuts behind each socket that lock the jack down tightly into either the panel or directly into a waiting 1.13 inch hole.