【Tungsten Carbide】: Thicker high quality tungsten carbide with a reinforced head that prevents jaw breakage. The surface is treated with anti-rust, with good abrasion resistance and extreme hardness, long service life. 【TRIANGLE HANDLE】: U-shaped slot design allows for quick dust removal of drilling dust. Triangular handle design, more stable operation, no slipping and no scratching, will not damage the glaze. (The cutting edge and hole are smooth and complete, leaving no burrs) 【PERFECT CUT】: The sturdy tungsten carbide tip with sharp design can easily penetrate various materials, easy to locate, stable drilling, at a high speed, no over-limit, clean and smooth opening. (Rotating thread design, smoother drilling and chip removal) 【VARIOUS SIZES】: 5pcs drill bit set with 4 different sizes (2 x 6mm, 1 x 8mm, 1 x 10mm, 1 x 12mm). Carbide drill bits are designed for durability and last longer than traditional steel drill bits. 【MULTIFUNCTIONAL】: Suitable for glass, ceramic tile, wood,