The 4 in 1 HDX Copper Fitting Brush Tool is a versatile and durable pipe tool designed for both inner and outer tubes in sizes 1/2" and 3/4". This set of 2 tools from the trusted brand HDX is perfect for cleaning and preparing copper fittings for secure installations. The brush design efficiently removes debris and ensures a smooth and efficient installation process, making it a must-have for any plumbing or pipe fitting project.