1. Outer diameter of brush and hole are in the same concentricity.
2. With good tensile strength of abrasive fiber.
3. Density of roller block and brush fiber is good.
4. Long life span.
5. Abrasive and roughness.
6. Pulling force is good or not.
7. Suction roller surface finished, elasticity and water absorption.
Note: The same type of roller brushes, different specification different use. Some roller brush can be burr, some can be polished copper foil cleaning, and some can be used for solder polishing.