Bar Knobs are best described as a Castle-type knob with four ‘towers’ that one can easily slip a bar into for leverage. Reid Supply offers three types including Tapped, Blank and Reamed. Also available are two different types of Base Diameters which are 1 – 1/8 inch and 1 – 1/2 inch. In this selection you will find the Malleable Iron Bar Knob with head diameters including 2 -1/ 2 inch.