Joysun Roloc quick change Scotch Brite surface conditioning discs are produced in R and S type locking mechanism styles. They feature a tough reinforced nylon web backing with a twist suitable for air grinders. The conditioning discs apply an even coating with grit for many different applications. Joyusun quick change surface conditioning discs are outstanding for heavy rust removal, burs free finishing and ultra-fine surface finishing. The flexibility of these discs in surface conditioning and finishing is only limited by the pressure of the holder.