The 10-251 is a no. 1 acid brush manufactured by GC ELECTRONICS. This brush is designed for applying solvents, coatings, and cleaners such as Freon TF and Chlorothene. With its horse hair bristles and steel handle, it provides durability and precision. Its compact size allows for easy handling and precise application. Although it is not ROHS compliant, it is still a reliable tool for your applications.