Includes 4 diamond drill bits (1/4", 5/16", 3/8", 3/4") and 1 extra 6mm carbide drill bit with hex shank, providing multiple size options for drilling holes in tile, porcelain, marble, and stone Built with high-quality vacuum brazed diamond grit (#45) for superior durability and longer service life. Designed to resist wear and deliver consistent drilling performance The drill bits are filled with cooling wax inside the core, helping reduce heat and remove debris during drilling. Can be used for dry drilling or with occasional water cooling Start drilling at a 45° angle, then gradually move to 90° once the groove forms for cleaner holes and better accuracy. No continuous water system required Standard 1/4" hex shank fits most corded drills, cordless drills, and drill presses. Ideal for drilling porcelain tile, ceramic, granite, marble, masonry, and stone Note: Not suitable for wood, plastic, or tempered glass Goldblatt 5pcs Glass Drill Holesaw Kits Included: 6mm (1/4”), 8mm (5/16”), 10mm (3/8”), 20mm (3/4”) and 6mm glass core drill bits vacuum brazed diamond of different sizes to meet your various tiling work requirements.