Extra Long 200mm 8-Piece Drill Bit Set, High-Speed Steel Drill Bits, Straight Shank with Diameters of 4mm, 4.2mm, 4.5mm, 5mm, 5.2mm, 6mm, 8mm, and 10mm, Wood Drilling Tool

[8 Different Sizes]: The twist drill bits come in 8 diameters: 4, 4.2, 4.5, 5, 5.2, 6, 8, and 10 mm. Different hole sizes can meet your needs. [High-Quality Materials]: Our twist drill bits are made of HSS 4241 high-speed steel, with complete milling technology, resulting in high hardness and durability. [Extra-Long]: The extra-long cutting edge, with a total length of 200 mm, allows you to use these drill bits for drilling deep holes. [Advantages]: Precise positioning, fast cutting speed, strong chip removal capacity, good wear resistance—these sharp twist drill bits make drilling easier and more efficient. [Wide Applications]: HSS drill bits are suitable for drilling cast steel, spring steel, mild steel, carbon steel, angle iron, aluminum, copper, wood, stainless steel from 1 to 4 mm thick, and other castings, as well as various other materials.