uxcell 20pcs HSS Speed W6542 Micro Drill Bits Fully Ground Jobber 20mm Long Drill Bits for Mild Steel Copper Aluminum 0.3mm 0.4mm (High Steel)

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Specification: Flute treatment: Fully polished; Drill bit diameter: 0.3mm/0.012inch, 0.4mm/0.02inch; Flute length: 5mm/0.2inch, 7mm/0.28inch; Shank diameter: 0.3mm/0.012inch, 0.4mm/0.02inch; Total length: 20mm/0.79inch; 20pcs x Drill bits HIGH SPEED STEEL: Made of high speed steel, it has high hardness, heat resistance, wear resistance, durability and long service life. Fully ground: Fully ground flute design reduces friction and heat for improved drilling performance. TWIST DESIGN: Split point tip and twist design improve cutting speed while easily self-centering and preventing migration. The twist design of the drill bit leaves a smooth hole after quick drilling. Note: Allow to cool when in use and handle gently. Proper use can significantly extend the life of your twist drill. The product is made of high speed steel. It has smooth surface finish and long service life. Suitable for wood, malleable iron, aluminum, plastic, etc. Use it to replace boring drill bits and improve your work efficiency. Straight shank design is suitable for many electric drills (not included here). Specification: Shank Type: Round Shank Tool Flute Type: Spiral Twist Drill Bit Diameter: 0.3mm/0.012inch, 0.4mm/0.02inch Material: High Speed Steel Shank Diameter: 0.3mm/0.012inch, 0.4mm/0.02inch Total Length: 20mm/0.79inch Drill Bit Length: 5mm/0.2inch, 7mm/0.28inch Package Content: 20pcs x HSS (High Speed Steel) Straight Shank Twist Drill Bits Note: Please allow to cool and use gently for correct use. The life of the twist drill bit will be significantly extended with proper use.