Specifications include, but are not limited to: 3-sec. Mast Arm Signal Bracket; The mast arm mount signal bracket shall consist of a clamp assembly for a 3-section head, including upper and lower arms and a vertical support tube. The bracket shall be adjustable about the support tube axis, vertically, about the mast arm and about the vertical plane. The upper and lower arms shall attach to the signal in a clamping manner to assure rigidity. The bracket shall be capable of accommodating all 3 section signal heads. The bracket shall be constructed such that all electrical wiring can be completely concealed in the bracket and shall accommodate a minimum of three 14 AWG/10 Conductor Cables. The clamp assembly shall be equipped with two cables. The cables shall be adjustable to fit all mast arm shapes without special tools or equipment. The cables shall be 144 inches long.