The RCBS Primer Pocket Brush is just the tool you need to clean out the residue from your primer pockets before reloading. This brush features stainless steel bristles to quickly and easily remove every last bit of residue, leaving the primer pocket as good as new. Not only does the RCBS Primer Pocket Brush feature stainless steel bristles, but it is made specifically to fit onto your RCBS Accessory Handle. Simply twist the threaded end onto your accessory handle, and you will be ready to go! What could be easier than that?