General description One drill bit replaces two drill bits (1 glass and tile bit + 1 masonry drill bit), perfect for drilling insert holes in bathroom tiles or wall mirrors. This 15-piece drill bit set features 4 different sizes, allowing for high-quality, precise drilling in various materials such as tile, concrete, brick, glass, plastic, and wood. The set is designed for use with electric drills and offers a long service life. Technical specifications Material: Tungsten Carbide Shank: 3-flat shank Color: Black and silver Sizes included: 2 x 6 mm (1/4 inch), 3 x 8 mm (5/16 inch), 3 x 10 mm (3/8 inch), 3 x 12 mm (1/2 inch) Measurement allowed error: +/- 1-3 cm Installation Do not use the impact mode of the drill or hammers. Usage When drilling hard materials (glass, porcelain tile, marble), use lubrication. Other information Package Contents: 6 x 6mm (1/4 inch) Drill Bit, 3 x 8mm (5/16 inch) Drill Bit, 3 x 10mm (3/8 inch) Drill Bit, 3 x 12mm (1/2 inch) Drill Bit. Note: Light reflection