KP-55 Motor 520K18This motor (part #520K18) is the core replacement component for the front end of the KUPA KP 55 professional nail drill handpiece (specifically noted as Version 101 in the manufacturer parts list). It is a high speed precision motor built to KUPAs specification, meant to restore proper rotation, torque and smooth operation when the existing motor has worn, suffered heat fatigue, or is otherwise underperforming. According to KUPAs parts listing.