Brownells 12 Gauge 5/16-27 Female Double-Up Brush, Pack of 12

The dual-action cleaning system for 12 Gauge shotguns includes an ultra-absorbent bore mop and a debris-scrubbing bore brush that can be screwed together, allowing for a single-step cleaning process. You can arrange them in your preferred order or add an additional mop or brush for enhanced cleaning effectiveness. Compatible with 12 Gauge shotguns Bristles composed of phosphor bronze, featuring a wound-steel shank and an aluminum coupling, with 5/16-27 threading