Based on this product's specifications, here are some alternatives and similar models
Diamond Core Bit Distar KORONA RS8-X 1 1/4" 102mm x 450mm for Wet Drilling
Summary description:
Distar KORONA RS8-X diamond core bit, model 10170085224, 1 1/4" connection, 102 mm cutting diameter and 450 mm length designed for wet drilling. Intended for fast, precise coring in concrete, reinforced concrete and masonry when used with water cooling. Suitable for use with compatible rotary core drilling rigs and stands for construction and renovation tasks.