PanaVise 120140B 40 lb. Short Drop Ceiling Mount Easy "one person" installation with our unique hanging system Overall length from ceiling bracket to bottom of adjusting base only 6" (152.4mm) Ceiling bracket is 4" (101.6mm) in diameter with four mounting holes on a 2.6" (67mm) bolt circle Includes matching bracket cover [5" (127mm) diameter] for a professional finish Steel shaft is 0.625" (15.9mm) in diameter