Octagonal glass knob with brass base. Available in 3 sizes: 1″ dia. , 1-1/4″ dia. , 1-1/2″ dia. and in 6 colors: clear, amethyst, translucent white, Depression green, amber and black. Each knob is available in 4 base finishes: Polished Brass, Polished Nickel, Brushed Nickel, Oil rubbed Bronze. Please specify base finish when ordering. This is the medium size.