Based on this product's specifications, here are some alternatives and similar models
Diamond Core Bit 1 1/4" (32 mm) 122/430 mm for Core Drills — Delphi Tools
Summary description:
Delphi Tools diamond core bit designed for core drills, with nominal connection 1 1/4" (approx. 32 mm) and dimensions 122/430 mm. Intended for drilling precise circular holes in masonry, concrete and similar mineral substrates. Suitable for use with compatible rotary core drilling machines; offers efficient material removal and long cutting life when used with appropriate cooling and drilling technique.