Brush, Semi Micro Test tube - Nylon White-EIS-CH0202A offers a thoughtfully designed, durable resource for hands-on learning. Semi-micro cleaning brush. The white, nylon fiber bristles are perfect for scrubbing narrow glassware, including test tubes, measuring cylinders, beakers and more. The stainless steel, twisted handle is semi-flexible, allowing you to modify the shape as needed. Looped end for easy hanging. Designed for professional science laboratories but is perfect for a variety of applications in the home or garage. Brush measures 7.25" in total length, with the bristle section measuring 3.25" and 0.5" in diameter, and handle measuring 4". Fits tubes, pipes, bottles, cylinders, flasks and straws with diameters of 0.25" - 0.4".