Simpson Strong-Tie® Hole Cleaning Brush, Series: ETB, Nylon Bristles, 1/2 in Dia x 3 in L Brush, 8 in L, For Use With: 1/4 to 5/16 in Dia Anchor/Rebar, 3/8 to 7/16 in Dia Hole
Brushes have a twisted wire handle with nylon bristles