Ultimate Drill Bits (7pcs) -Multifunctional Ceramic Glass Hole Working Sets Features: SAVE TIME & EFFORT for your metal/wood drilling project Drill Bit is made of industrial-grade 6542 HSS Carbide and durable alloy to perform excellent high-speed drilling. With W-type slot design, it allows easier chip removal and reduces resistance, resulting in smoother drilling. Ideal for everyday drilling on multiple materials including steel, alloy, tile, concrete, brick, glass, plastic, wood and more. FEATURES: 1.Premium material 6542 HSS Carbide and durable alloy with reinforced head prevent bit cracking and provide longer life. 2.Wide usage Strong carbide tip with spear pointed design can easily drill through various materials like tile, concrete, brick, glass, plastic, wood, etc. 3.Easy chip removal W-type slot design provides low resistance, resulting in faster & smoother drilling and easier chip removal. 4.Anti-slip shrank Triangular shank allows drill bits to be held tightly and prevents slip. 5. Different sizes 3mm cutting diameter: 40mm / 1.6in 4mm cutting diameter: 42mm / 1.7in 5mm cutting diameter: 42mm / 1.7in 6mm cutting diameter: 55mm / 2.2in 8mm cutting diameter: 66mm / 2.6in 10mm cutting diameter: 70mm / 2.8in 12mm cutting diameter: 75mm / 3.0in Universal Can be installed in any standard electric drills. Package including 7pcx Drill Bits