Usage Tips:Package Quantity: You will get a total of 4 duct cleaning tools including 2 4-in-1 duct cleaning brushes and 2 inner and outer reamers for daily duct cleaning and repairs Size Information: Pipe cleaning brush length is 20cm/8", cleaning hole diameter is 1.5cm/0.6", 2cm/0.8", inner and outer reamer diameter is 1.5", reamer is suitable for 3/16" to 1-1 / 2 inch pipe diameter Multifunctional design: the cleaning brush has 2 different cleaning diameters, suitable for pipes of different diameters; the front and rear ends have different thickness brushes; the anti-slip design of the handle is all integrated into one body; it is a good tool for effective work Convenient design: burrs can be removed clockwise and counterclockwise, pipe reamer is suitable for use inside and outside the pipe; the screw of the pipe cutter can easily control the cutting pressure for a clean cut Versatile: Versatile manual metal rust removal tool to clean steel parts, machinery, unfinished metal parts, paint stains, special corrosion without damaging the surface or its fine properties, cleaning, polishing, paint/rust removal; make welding a Very easy and tool to make pipes shine again