Weiler Turbo Tube Brush, Stainless Steel 302, Round Shank, Single Stem, 1/2" Inside Diameter, 5/8" Outside Diameter, 0.008" Wire Diameter, 1/4" Shank, 1000 rpm (Pack of 1) Rust-proof stainless steel bristles, clean I.D. and O.D. with the same tool Fitting brush cleans inside diameter Ideal for plumbing and HVAC projects Clean I.D. and O.D. with the same tool 3/4" Inside Diameter, 7/8" Outside Diameter,