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Complete 40-Piece Set: This 40-piece silver diamond drill bit set includes 4 sizes (1mm, 1.5mm, 2mm, 2.5mm), 10 pieces per size. It fully meets the needs of various precision drilling and grinding tasks Premium Composite Material: Made of high-quality diamond coating and solid iron matrix, it features exceptional hardness and wear resistance. It is not easy to break or deform, ensuring long-lasting durability Universal Tool Compatibility: With a standard shank diameter, it is compatible with most rotary tools, including hand drills, drill presses, flex shafts and hanging mills. It allows for quick and easy bit changes Wide Material Adaptability: It works smoothly on glass, ceramic, stone, marble, jade, resin, plastic, wood and metal. It is an essential tool for various material processing tasks Multi-Purpose Application: Ideal for jewelry making, DIY crafts, home repairs, stone processing and pet nail care. It is a versatile tool set for both professional and personal use