Based on this product's specifications, here are some alternatives and similar models
Wall Grinder Spindle Unit THZ600 (model YTHZ01WR) — replacement spindle for wall grinder
Summary description:
Replacement spindle unit for THZ600 wall grinder (MPN YTHZ01WR, EAN 5903755063663). Designed as a mechanical component for sanding and grinding surfaces with a THZ600 wall sander. Serves as the rotating axle that holds sanding discs or heads, enabling transfer of motor torque to the abrasive tool. Suitable for repair or maintenance of compatible THZ600 grinders.