General description The Piece Drill Bit Set is designed for drilling through a variety of hard materials including tile, glass, concrete, stone, brick, ceramic, and mirrors. The set includes drill bits in sizes 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, and 12mm, making it versatile for different applications. Technical specifications Material: Tungsten carbide tip Sizes included: 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm Head material: Alloy with higher hardness Usage When drilling hard materials such as glass, porcelain tiles, marble, or granite, it is recommended to use water for lubrication to enhance performance and prolong the life of the drill bits. Other information U-shaped slot design for quick dust removal Triangular handle design for more stable operation Any issues can be resolved with a refund or replacement