The Bore-Max Speed Brush is a high-efficiency cleaning tool designed with twice the bristle density of standard brushes for superior scrubbing power. Its stiff nickel-plated phosphor bronze bristles resist chemical breakdown in your bore and extend brush life while remaining impervious to solvents. The 8/32" threads ensure easy operation making this compact yet powerful speed brush an ideal choice for efficient deep-cleaning.Features:NICKEL PLATED - IMPERVIOUS TO SOLVENTSDUAL DENSITY BRISTLES SCRUB HARDER8/32" THREADS