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
Brushes have a twisted wire handle with nylon bristles