【TUNGSTEN CARBIDE】: Thicker tungsten carbide, superior quality, with reinforced head that prevents the bits from breaking. The surface is treated with anti-rust, with good abrasion resistance and extreme hardness, long service life. 【TRIANGULAR HANDLE】: The U-type slot design allows for quick dust removal of drilling dust. Triangular handle design, more stable operation, no slippage and no scratching, will not damage the glaze. (The cutting edge and hole are smooth and complete, leaving no burrs) 【PERFECT CUTTING】: The sturdy tungsten carbide tip with sharp design can easily penetrate various materials, easy to locate, stably drill, fast speed, not breaking the boundary, opening neat and smooth. (Rotary thread design, smoother drilling and chip evacuation) 【DIFFERENT SIZES】: 5 PCS drill bits set with 4 different sizes (2*6mm, 1*8mm, 1*10mm, 1*12mm). Carbide drill bits are built to last and will outlast conventional steel drill bits. 【MULTIFUNCTIONAL】: Suitable for glass, ceramic tile,