Based on this product's specifications, here are some alternatives and similar models
Diamond drill bit for gres Smart 27 mm (brand: Smart, MPN 25-270)
Summary description:
Diamond drill bit 27 mm for gres by Smart, designed for drilling holes in dense ceramic materials and porcelain stoneware. Diamond cutting edge provides efficient cutting and longer tool life when used with water cooling. Suitable for use with electric drills and drill rigs for bathroom fixtures, tile installation, plumbing and ventilation penetrations in hard glazed surfaces.