The RCBS Primer Pocket Brush is a great tool reloaders can use to remove the residue from primer pockets making them cleaner. Brushes are made from stainless steel bristles and are made to fit the RCBS Accessory Handle (product # 477-820) sold separately. Notes: Threaded ends fit the included RCBS accessory handle (sold separately)The brush section is smaller in diameter than what the primer pocket will measure