These New "BM" Series of CRL Pull Handle/Towel Bar Combinations with Metal Washers are provided with all the hardware needed for installation. They are constructed of 1.5 mil thick heavy brass tubing. Each set consists of a pull handle and towel bar, along with decorative metal back-up washers and plastic protective washers to protect against glass-to-glass contact. The "BM" Series Pull Handle/Towel Bar Combinations come in several stock finishes with custom finishes available upon request.Specifications:3/4 inch (19 millimeter) diameter brass tubing (1.5 mil thick)1-1/4 inch (31.8 millimeter) diameter metal washersGlass Thickness Range: 1/4 to 1/2 inch (6 to 12 millimeter) Hole Diameter Required: 1/2 inch (12 millimeter)Center-to-Center Hole Spacing:Six Inch Pull = Six Inches (152 millimeters)Eight Inch Pull = Eight Inches (203 millimeters)12 Inch Towel Bar = 12 Inches (305 millimeters)18 Inch Towel Bar = 18 Inches (457 millimeters)22 Inch Towel Bar = 22 Inches (559 millimeters)24 Inch Towel Bar = 24 Inches (610 millimeters)