About this item. 5 drill sizes for different needs: The set includes 5 twist drills, which are the most popular drills, the diameter is 2mm, 3mm, 3.5mm, 4mm, 5mm. You can choose bits of different sizes to drill different holes as you wish. These drills can meet your different needs. High hardness drill: Twist drills are made of high quality high speed steel. These metal drills have high hardness, are durable, have high abrasion resistance and have a long service life. The use of high-speed steel drill material can improve the efficiency and convenience of processing. Extra long edge: The drills are 150mm ~ 160mm long, long enough and sharp, so you can use these drills to drill deep holes, and the bit tips are very shaped. The sharp spiral of the twist drills makes drilling easier and more effortless. It is a set of long drills that are ideal for your daily life. Application: The drill has a wide range of applications, ideal for most drilling jobs. Especially suitable for aluminum, wood, plastic and other soft materials. (Note: not for hard metals). Easy to use: Drill with double chip removal design, these wood drills can facilitate drilling and chip removal. The cutting head design offers a central point, great maneuverability, faster with less effort. And the round shank fits most types of hand drills and impact drills.