3M 7000121723 – Standard Abrasives™ Quick Change TS P.A.R.T. #21 Disc Mandrel 541151, 5/8 in TA4 (PILOT) Top Pick

3M 7000121723 – Standard Abrasives™ Quick Change TS P.A.R.T. #21 Disc Mandrel 541151 is a 5/8″ TA4 (PILOT) mandrel used to secure P.A.R.T. Discs to rotary tools. Designed for cleaning and prepping painted or corroded surfaces prior to re-riveting or grounding.