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Holder Burrite-Style Brushes with 1/8" Stem, Adapts to 1/4" Stem Burrite-Style Power Tube Brush Holder features 3/8" stem for mounting into the chuck of a drill or the collet of a machine tool and allow the brush to be used in either direction of rotation. For brush stem diameter 1/8" 1/4 in stem for convenient mounting into the chuck of a drill or the collet of a machine tool and allow the brush to be used in either direction of rotation. For brush stem diameter 1/8 in.