3M Automotive (3M 07546) 3M Scotch-Brite Roloc Brake Hub Cleaning Disc - 10 Pack Extremely tough non-woven web removes rust and corrosion without excessive metal removal or gouging Contains no wire filaments Ideal for effective removal of buildup on brakes Silicon carbide mineral cuts sharp Disc features a hollow center, enabling operators to slide over and around hub without damaging the stud threads