Simpson Strong-Tie® Hole Cleaning Brush, series: ETB, Nylon Bristles, 1-1/4 in dia x 4 in L Brush, 29 in L, For Use with: 7/8 to 1 in dia Anchor/Rebar, 1 to 1-1/8 in dia Hole. Simpson Strong-Tie® ETB10 Hole Cleaning Brush, 1-1/4 in dia x 4 in L Brush, 29 in L, Use with 7/8 to 1 in dia Anchor/Rebar