100% black nylon tube brushes provide long wear and excellent cleaning properties. Use for removing dirt, chips, and other accumulations from internal surfaces such as tubing, internal bores, drilled holes, cylinder bores, and drilled or tapped holes. (Only Item 06133 contains white nylon and all other items 06134-06141 contain black nylon). These brushes are for hand operation only, it is not recommended to use these for any power driven applications.