(10) Red 2.5 inch Round LED Truck Trailer Side Marker Clearance Lights / Stud Pack of (10) 2-1/2" Round Red LED Truck Trailer RV Clearance Marker Lights Pack of (10) 2.5" Diameter Red LED Marker Clearance Lights... 5 LEDs In Each Light... Unique Lens Design Makes The Light More Visible From Various Angles And Spreads The Light To A Greater Area... Easy Installation. Only One Small Hole Required. Light Is Fastened In Place From Behind Mounting Surface... Light Is Grounded Through Mounting Stud. If Light Is Not Mounted Onto A Metal Surface Then A Ground Wire Would Need To Be Connected To The Mounting Stud... 12V Input. DOT Approved. Black Wire - Hot Lead...