<p>About this article. </p><p>5 drill bit sizes to meet different needs: This set includes 5 types of twist drills, which are the most popular drill bits, with diameters of 2mm, 3mm, 3.5mm, 4mm, and 5mm. You can choose different sizes of drill bits to drill various holes according to your needs. These drill bits can meet your various needs. </p><p>High hardness drill bits: The spiral drill bits are made of high-quality high-speed steel. These metal drill bits have high hardness, durability, high wear resistance, and long service life. Using high-speed steel to drill materials can improve the efficiency and convenience of processing. </p><p>Extra-long cutting edge: The drill bit length is 150mm ~ 160mm, which is long enough and sharp, allowing you to use these drill bits to drill deep holes, and the drill tip shape is very good. The sharp groove of the twist drill will make drilling easier and more labor-saving. This is a set of long drills suitable for your daily life. </p><p>Application: This drill bit is widely used and is ideal for most drilling operations. Especially suitable for aluminum, wood, plastic and other soft materials. (Note: Not suitable for hard metals). </p><p>Easy to Use: The drill bits feature a double-groove chip removal design, these wood drill bits allow for easy drilling and chip removal. The cutting head design provides a center point for maneuverability, faster speed, and less effort. The round shank fits most types of hand drills and hammer drills. </p>