THESE ARE 17 GLASS INDUSTRIAL TYPE SCREW ON LIGHT COVERS.THEY ARE DOME SHAPE MEASURE OVER 6 INCHES TALL 3 INCHES IN DIAMETER.THEY HAVE ISSUES OF DIRT THOUGH NO CHIPS OR CRACKS.ALSO INCLUDED ARE 2 METAL OUTLETS FOR THE GLASS DOMES NO SURE IS OUTLETS WORK.GLASS IS A THICK GLASS.