Genuine Geber A019001RB shower arm flange in rubbed bronze finish. Over all diameter is about 2 5/8", the center hole diameter is about 13/16". This replaces Gerber 92-021RB. Other part numbers are A019001RB, A019001, 019001, G0092021RB, 0092021RB, 92021RB, 92-021RB.