This bracket and porcelain insulator is an exact match to the patent drawings. Reference the patent drawings and description at: http://reference.insulators.info/patents/detail/?patent=1240330&type=U The base of the insulator measures 2 13/16 inches in diameter (the two halves together) and the height is 4 1/2 inches. The length of the arm from the insulator to the base plate is 1 3/8 inches. On one side of the arm is embossed LF in an embossed circle. On the opposite side are embossed PAT. APPLIED (in an arc) / FOR