Iztoss Chrom Red Cool Skull Head Motorcycle Chopper Cruiser Rear Tail Light For Harley Lens Size: L 4" x W 7" (10 cm x 18 cm) Screw hole Diameter: 6MM,Screw hole spacing: 3CM (1.18") Voltage: DC 12V Wattage: total 20w, Cable Length: 50CM, 3 wires connection system.