07515 - 3M - Features and Benefits: Quick 1/2 turn on, 1/2 turn off Roloc disc fastening system Use with 3M Roloc Disc Pad 05539 Best used on aluminum parts Maximum operating speed: 25,000 2" Blue Very Fine 25 discs per boxUsed to quickly remove cut cork or paper gaskets and form in place gasket materials prior to the assembling of power train components. Used for aluminum parts.