Introducing the Test Tube 4" Brush with a 12" long handle, perfect for reaching those hard-to-clean areas in your science lab. These natural bristle brushes are mounted in twisted heavy gauge galvanized wire for durability and feature a radial top for easy gripping and maneuvering. With nylon bristles and a 1.5" brush diameter, this brush is ideal for effectively cleaning test tubes and other laboratory equipment. The long handle provides extended reach, making it a versatile tool for any science experiment or research project. Keep your lab clean and your equipment in top condition with the Test Tube 4" Brush.