The Stil Crin Brass brush is suitable for ball barrels and is supplied with a 1-8" internal thread for the calibers 4.5mm, 5.6mm, 6.5mm, 7mm, 9mm and .44/.45 and with an external thread for the calibers 8mm and 9.3mm. There is a separate one for this Adapter with 1-8"/M5 internal thread available.
