For cleaning copper fittings, this crimped wire brush is an essential tool. It features a 3/4 inch inner diameter and is made of durable carbon steel, ensuring effective removal of debris and buildup. The brush has a 7/8 inch outer diameter, making it suitable for various plumbing applications. Weighing only 0.10 lbs, it is lightweight and easy to handle, allowing for efficient cleaning and maintenance of fittings.