Diverse Core Bits for Various Applications: Marble, Granite, and Porcelain Brazed Core Bit for Marble Ideal for: Marble, tile, glass, porcelain, and other soft stones. Dia Plus Core Bit with Side Protection for Granite and Natural Stone - 1-3/8" Designed for: Granite and natural stone Features: These dry core bits come with side holes for effective heat dissipation, ensuring a cool and efficient drilling process. Diamond side protection enhances cutting performance throughout the drilling procedure. Thin Wall Core Bit for Porcelain and Quartz - 1-3/8" Perfect for: Smooth and chip-free coring of porcelain and quartz materials. Small Rubber Ring Function: The rubber suction ring creates a water dam within the core bit's working area, enhancing efficiency. Milling Chamfering Cone Bit - 2 Inch Cone Premium Tool for: Enhancing, polishing, and chamfering pre-existing holes using high-quality diamonds. This tool is versatile and effective in various applications.