<http://schema.org/description>
"These knobs fit on Glockenklang preamps that have stacked (concentric) pots. Fits pots that have a lower shaft or 6mm and upper shaft of 4mm. Secures with set screw."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.bestbassgear.com/glockenklang-euro-style-stacked-dome-knob.htm>