Nice 18" White Milk glass towel bar.  Does show normal wear with light scratches. There are no chips in the glass. The bar ends are flared. Has worn thin chrome over metal floating ends. One bracket does have a broken off mounting hole as shown in pictures.  Overall, in salvaged condition. The brackets are unmarked the manufacturer is unknown.  The brackets are adjustable in width.  Please look over the pictures below and ask questions when needed. Thanks for looking. 

Measures approx. 17 5/8" wide at bar x 16 3/4" on center x 2 3/8" depth off wall

Inside measurement: 1 3/4" depth x 16 1/2" wide   

Bar diameter: 1/2" diameter x 17 5/8" length 

Wall brackets: 2 1/4" tall x 3/8" wide x 2 3/8" depth