3M(TM) Trizact(TM) Hookit(TM) Cloth Dust Free Disc 337DC, A300, 5 in x NH Die # 500FH 5 Holes, 50 per case Trizact abrasives are designed for use in AOEM body shop applications for blending and finishing scratch marks in white metal repair created by previous grinding or repair steps, such as metal files or rotary tool used for silicon bronze weld leveling. It provides a very fast scratch removal capability combined with a superior finish, leaving the surface ready for e-coat application, while providing an outstanding long life due to the pattern design of the Trizact features.