The 50 Dental Diamond Burs Kit features high-speed carborundum needles with a 1.6mm shank diameter. The grinding heads are made of natural diamond powder, ensuring high hardness and wear resistance. The handles are crafted from high-grade stainless steel, providing strength and rust resistance. The blue and green burs can reach a maximum rotational speed of 450,000RPM/min, while the yellow one reaches 300,000RPM/min and the red one reaches 160,000RPM/min. These burs are perfect for dental procedures, offering precision and efficiency. Upgrade your dental tools today! Features 1. Grinding head using natural diamond powder, high hardness, wear resistance. 2. Handle adopt high-grade stainless steel, high strength, no rusty. 3. The max rotational speed of the blue and green one is 450,000RPM/min. 4. The yellow one is 300,000RPM/min and the red one is 160,000RPM/min. Specification: Materials: Stainless Steel + Diamond Powder Size: 42 x 7 x 30mm Specific models: BR-30C, DI-SS41, TR-11, TF-21EF, CR-22F Shank diameter: 1.6mm Package Includes: 50 x Dental Diamond Burs