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Simpson ETBS Wire Hole-Cleaning Brush - Standard (Hole Diam: 11/16 Useable Length: 5") 1/4-28 Grade 5 Hex Cap Screws Zinc Plated - Domestic USA 9/16-12 x 3 Grade 8The Simpson ETBS Wire Hole Cleaning Brush is a must have tool for contractors, plumbers, and electricians. It has an 11 16" hole diameter and a 5" useable length offering superior versatility and access. Its tough steel bristles allow for durable and effective cleaning of hard to reach spaces.