Based on this product's specifications, here are some alternatives and similar models
Hole saw arbor for core drills HOGERT HT6D463 — bi-metal centering arbor, 32–152 mm range, 7/16" hex shank
Summary description:
HOGERT HT6D463 is a bi-metal centering arbor for hole saws and core drills, compatible with cutter diameters from 32 to 152 mm. It features a 7/16" hex shank for secure mounting in drills and drivers, a centering pilot for precise starts, and bi-metal construction for durability when working with wood, plastic and metal. Suitable for installation, plumbing and electrical rough-in work.