✅ OEM Replacement interior diameter fitting brushes specifically made to perfectly clean standard copper pipe fittings. ✅ High density soft stainless steel bristles designed to remove oxidation while leaving a superior smooth finish for optimum sweat soldering of copper pipe. ✅ Extremely duriable, these brushes will stand up to repetive commercial workflows. ✅ DO NOT use these brushes for cleaning the inner diameter of the copper pipe, they are specifically designed for copper pipe fittings. They may be used for exterior cleaning of brake studs, machine surfaces or any application requiring the removal of oxidation while preserving the underlying material. ID Brush