REAL AVID Bore-Max® Speed Brush®Bore Max Speed Brush FASTER RESULTS. LESS EFFORT. 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