This Eisco Labs Bristle Cleaning Brush measures 9.25" in total length and features a fan-shaped bristle end with a twisted stainless steel wire handle. The brush is designed to clean test tubes, bottles, cylinders, and straws with inner diameters of 0.3"–0.5". The stainless steel handle resists corrosion and provides moderate flexibility for reaching inside curved and narrow glassware. The fan-shaped bristle tip provides thorough scrubbing coverage. Suitable for maintaining laboratory glassware cleanliness.