uxcell M12 Steel Wire Pipe Tube Sweep Cleaning Chimney Brush 20mm Diameter 2pcs Product Name : Steel Wire Tube Brush; Bristle Material: Steel Brush Size: 105 x 20mm / 4.13 x 0.79" (L*D); Total Length: 175mm / 6.89" Bristle Dia: 0.35mm / 0.01"; Package Content: 2 x Steel Wire Tube Brush The 20mm dia male thread end for mounting. Great for cleaning and rust removal inside of objects such as pipes, chimney .