Replacement bolt and bracket set. Use this bracket set to convert your drum from a natural skin head to a synthetic head. The ring has an inside diameter of 13 inches and an out side diameter of 14 inches. This bracket fits the Remo African Drum Head, 12 inch, code SHB2. Use them to covert our DJB2 djembe and the ASKM KAKB2 ashikos to a synthetic head.