About this item. 5 drill sizes for different needs: The set includes 5 twist drills, which are the most common drills, the diameter is 2 mm, 3 mm, 3.5 mm, 4 mm, 5 mm. 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 a long service life. The use of high-speed steel drill material can improve processing efficiency and convenience. Extra long edge: The drills are 150 mm ~ 160 mm long, long and sharp enough, so you can use these drills to drill deep holes, and the tips of the bits are very shaped. The sharp flutes of the twist drills make 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 flute design for chip removal, these wood drills can facilitate drilling and chip removal. The cutting head design provides a central point, great maneuverability, faster with less effort. And the round shank fits most types of hand drills and impact drills.