Based on this product's specifications, here are some alternatives and similar models
Chuck key Proline 6/8/10 mm 12-tooth model 31388
Summary description:
Proline chuck key 31388 is a manual tool for tightening and loosening drill chucks with 12 teeth, compatible with 6 mm, 8 mm and 10 mm chuck sizes. It provides mechanical engagement via the 12-tooth gear for secure grip on drill bits and accessories. Suitable for workshop, maintenance and DIY tasks requiring reliable chuck adjustment.