8 DIFFERENT SIZE: Twist drill bits are 8 kinds of diameters, 4\4.2\4.5\5\5.2\6\8\10mm, different size holes to meet your needs< /p> HIGH QUALITY MATERIAL: Our twist bits are made of HSS 4241 high speed steel, full milling process, for high hardness and durability ULTRA-LONG: The extra long cutting edge of total 200mm allows you to use these drill bits for drilling deep holes ADVANTAGE: Precise positioning, fast cutting, strong chip removal, good resistance to ;wear, sharp twisted drill bits will make drilling easier and easier. WIDE USAGE: HSS drill bit is suitable for steel castings, spring steel, white steel, ordinary steel, angle steel, aluminum , copper, wood and stainless steel 1-4 mm, etc., drilling various materials HSS Twist Drill Bit Set Round Shank 4-10mm, Drilling Tools 200mm Length for Wood, Metal and Steel Features: -Twisted spiral design, easy to remove sawdust, iron filings at work. - 8 different diameters available 4mm , 4.2mm, 4.5mm, 5mm, 5.2mm, 6mm, 8mm, 10mm. - For DIY projects, process and general construction engineering applications < p>-Our ultra-long twist drill bit is made of HSS high speed steel and is completely countersunk compared to other products. -It has precise positioning, fast cutting, cutting capacity 39;high chip removal and good wear resistance. Specification: Material: High Speed Steel Diameter: 4mm, 4.2mm, 4.5mm, 5mm, 5.2mm, 6mm, 8mm, 10mm Length: Suitable. 200mm Quality: 8 pieces Package content: 8 x twist drill bitsgetveryrich