Our Most Popular Towel Bar Decorative Metal Washers Also Serve to Cover Any Defect in Hole in Glass Heavy 19 mm Diameter Brass Tubing (1.5 Mil Thick) Numerous Finish Choices in Sizes Ranging From 12″ to 30″ (305 to 762 mm) Sizes Ranging From 12″ to 30″ (305 to 762 mm) The BM Series of Single-Sided Towel Bars With Metal Washers are designed for glass mounting on fixed panels or doors. The 3/16″ low profile end caps make this an ideal bar for sliding bypass doors as well. The bars are constructed of 1.5 mil thick heavy brass tubing. Decorative metal back-up washers are included, as well as plastic washers to protect against glass-to-metal contact.