Professional bronze rifle bore brushes designed specifically for 20 caliber firearms with 8-32 male threading for reliable cleaning performance.Bronze Rifle Bore Brush - 20 Caliber8-32M threading for secure attachment12-pack quantity for extended useBronze bristles for effective bore cleaningProfessional-grade constructionEssential for proper firearm maintenance these bronze brushes effectively remove fouling and debris from 20 caliber rifle bores while being gentle on barrel rifling.