Unfinished Cast Brass Large Starburst Backplate. The backplate comes with 1/8ips (7/16in) Slip Through Center Hole. The Backplare Measures 6-1/4in Long and 4-1/4in Wide. Attached your Arm to a Backplate. The Backplate is used to Cover the Electrical box. Backplates of Brass Casting are used in the h... See More