Multifunctional Ultimate Drill Bits Ceramic Glass Punching Hole Working FEATURES: PREMIUM MATERIAL: Carbide with a reinforced head that prevents bit cracking; drill bit set made of hard and durable alloy, provides longer life. UNIQUE DESIGN: U type slot design with fast drilling dust remove, antiskid handle allows the drill bit to be held tightly and stable in power drill. WIDE USAGE: Spear pointed design strong tungsten carbide tip can easily penetrate various material like tile, concrete, brick, glass, plastic, and wood, etc, and reduces breakout. Suitable for home use or commercial use: When installing household appliances and furniture, the drill bit can save time and effort and complete the project easily. TIP: When drilling hard material such as glass, porcelain floor tile, marble, granite, etc, please use water for lubrication. PRODUCT DESCRIPTION: The material of Multi-Material Drill Bit is high quality cemented carbide, which prevents drill cracking and improve durability.One drill bit replaces two drill bits (glass & tile drill bit and drill bit). Pointed design with carbide as a material can easily penetrate the various material.U type slot design an increased opening speed, easy chip removal. SPECIFICATION: Material: Hard Alloy Tool Holder Type: Handle Cooling Type: Outer Cold Category: Hole expansion drill Optional Style: 3mm,4mm,5mm,6mm, 8mm, 10mm, 12mm Weight: Approx. 20-69g Blade Diameter: 3-12mm PACKAGE INCLUDED: 6 Ultimate Drill Bits NOTE: Please be sure to add water to cool when using. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures.