ABU Ambassadeur Medium Fibre Brake Collar. Better known as the centrifugal brake blocks these are the medium size blocks which fit many of the older Ambassadeur models.
Size: 3.5mm long x 2.9mm outside diameter x 1mm bore.
They do not fit later model reels. If in doubt please check the schematic for your reel or contact us for help.
ABU part No 1880.