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Simpson ETBS Wire Hole-Cleaning Brush - Standard (Hole Diam: 1 Useable Length: 5") 1 3/8-6 Socket Cap Screws Alloy #55 Heavy Duty Drill BitSimpson ETBS Wire Hole Cleaning Brush Standard provides an effective and efficient way to clean large diameter holes. With its useable length of 5 inches, it is suitable for cleaning 1 inch holes in any material.