Features:1. Set: there are 33 chrome vanadium steel drill bits, sufficient to meet your daily needs and ; You can also share with your family and friends who love handicrafts or are engaged in handicraft work.2. High-quality materials: The saw head is made of high-strength chrome vanadium stainless steel, which makes these saw heads durable and accurate, not easy to deform or wear, provide sharper cutting edges and longer service life.3. Excellent design: the drill bit is well made and the surface is smooth; The side cavity design is convenient for drilling, which improves the drilling speed and finishes the work more efficiently.4. Wide range of applications: Hollow drill bits can be used with confidence and have a wide range of applications. They are suitable for drilling stones of various materials, such as glass, ceramic tile, block jars, ceramic tile, ceramic, slate, marble and granite.5. Portable: The compact size is easy to use, transport and store, and does not take up too much space; Use a drill with enough water for lubrication and cooling. Description: This hollow bit is made of high-quality chrome vanadium steel, which is durable, very strong and has a long service life. Specifications:Material: Chrome Vanadium Stainless SteelCategory: Hex Screwdriver SetStyle: Hollow BitsSize: 68*48*29mmPackage Included:33 pcs. * empty bitNotes:1. Please allow 0-1 inch error due to manual measurement. Thank you for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object.