Joysun Roloc quick change 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 surface conditioning discs apply an even coating with grit for many different applications. Joysun Surface conditioning quick change discs are outstanding for heavy rust removal, burr free finishing and ultra-fine surface finishing. The flexibility of these discs in surface grinding is only limited by the pressure of the holder.