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High Quality Material: The long drill bits is made of high-quality HSS (high-speed steel). Compared with other drill bits, it is sturdy and durable, has higher wear resistance and firmness, and has a long service life. Extra-long Brill Bits: The length of the twist drill is 150mm~160mm. These drill bits are sharp and durable and can drill deep holes. You use these drills to drill deep holes, which can speed up the drilling and chip removal process. 5 Sizes Drill Bitss: Drill bits include 5 different sizes of drill bits. The diameter is 2mm 3mm 3.5mm 4mm 5mm drill bit. You are free to choose the right drill bit. Simple Operation: Our long wood drill bit has a chip removal design, and the twisted drill makes drilling easier and easier. The extra-long cutting edge allows these drills to drill deep holes. Wide Range of Applications: The drill bits has use for drilling wood, wood, rubber, plastic, steel plate. It is widely used for drilling many electric drills, automobile spring steel and die steel.