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This is a high-end eco-friendly M35 cobalt steel drill bit set, which is eco-friendly and safe, high temperature resistant, long life, and can quickly cut hard metals such as stainless steel and cast iron. It is a very user friendly cutting tools. Features : The cobalt drill bit set is available 1.5mm, 2mm, 2.5mm, 3mm, 3.2mm, 3.5mm, 4mm, 4.5mm, 4.8mm, 5mm, 5.5mm, 6mm, 6.5mm for your different needs. Benefit from the M35 cobalt steel material, the bits for hard metal is high heat resistance for long life. The straight shank design allows the drill bits for steel to be securely fastened and precision-finished. The cobalt drill bits are suitable for standard drill chucks and conventional round chucks. The drill bits for hardened steel are widely used in metalworking, which is great for cutting stainless steel and cast iron, not suitable for glass or ceramic. The twist drill bit set is lightweight and portable with plastic case for easy carrying and storage. Designed with a 135 degree split point, the drill bits set can be cut through stainless steel and cast iron precisely and faster with less power. The metric drill bits set is perfect for cutting hard alloys such as stainless steel and cast iron, not suitable for glass or ceramic. Specifications: Type: Metric straight shank twist drill Material: M35 cobalt steel Color: As the picture shows Weight: 130 g / 4.58 oz Size: 5.3 x 2.9 x 0.5 inches Suitable for stainless steel and cast iron Tips: 1.As for the different display, there will be a little color difference of the metric straight shank twist drill. 2.If you have any questions, please feel free to contact us. We will give you a satisfactory answer.