Before truckers carried those large reflective triangles, their predecessors used kerosene fueled traffic flares to warn on-coming traffic of a breakdown up ahead. The bottom pot twist-locks to the mounting bracket, while the others interlock with a top cap secured by screw-lock device. This set has been restored with fresh wading, clean top caps with the pots painted green and the mount painted red. 16.5" H x 5.5" diameter. CAN NOT SHIP. LOCAL PICKUP ONLY!