Based on this product's specifications, here are some alternatives and similar models
Proxxon Adapter disc 50 mm for WP/E WP/A EP/E EP/A
Summary description:
Proxxon adapter disc 50 mm (MPN PR29098) is an accessory designed to attach 50 mm discs to compatible Proxxon rotary tools and polishers in WP/E, WP/A, EP/E and EP/A series. It provides a mounting interface for small sanding, polishing or grinding discs, enabling precise work on narrow surfaces, model making, jewellery and detailed finishing tasks.