Solar Road Studs On Discount Synchronous Flashing Road Stud. Solar LED Inpavement Road Studs SRS0150B. Item No.:SRS0550B Solar LED inpavement road studs / solar led inpavement road markers Size: Dia.50mm, Height: 26mm 1. Single direction or double directions optional 2. Perfect water proof, IP 68 3. Can stand snow plough, only 3.5mm over the road.