Based on this product's specifications, here are some alternatives and similar models
Diamond Core Bit Distar KORONA RS6 1 1/4" 82mm x 450mm for Wet Drilling
Summary description:
Distar KORONA RS6 diamond core bit, 1 1/4" connection, 82 mm cutting diameter and 450 mm overall length, designed for wet drilling. Intended for cutting core samples in concrete, reinforced concrete and masonry using water cooling to extend segment life and reduce dust. Suitable for core drilling rigs and hand-held core drills with compatible thread.