The 3M TN platform allows operators to quickly change 3M products without tools and retaining nuts. Use with TN Discs Mounting type: TN colour: Black. Converted shape: Backup pads, Disc density: hard Diameter: 10.2 cm Equipment - Machines: Disc grinder,Angle grinder, Rotary grinder shape: Quick change. Function/mounting type: Mechanical attachment Product form: Disc block type: Lock nut Maximum speed: 13300 Thread size: 5/8-11 INT.