Solar Road Marker ( Embedded Design) Installation Size: Dia.80 X 30mm. 1 or 2 directions customized. 360 degree illuminated. 3.5mm after installation : SRS01100A. Solar Road Marker ( Embedded Design) Installation Size: Dia.100 X 26mm. 1 LEDs on the top. 360 degree illuminated. 3.5mm after installation: Aluminum Embedded Solar Road Stud SRS022