Octagonal glass knob with brass base. Clear glass. Available in 3 sizes (1″ dia. , 1-1/4″ dia. , 1-1/2″ dia.), 4 colors (clear, black, Depression green and white), and 4 base finishes (Polished Brass, Polished Nickel, Brushed Nickel, Oil rubbed Bronze). Please specify base finish when ordering. This is the large size.