DescriptionDrill through concrete easily with help from this steel drill bit set. The drill bits make great choice when working with high hardness materials. Suitable for professionals and personal use, the drill bit set comes in handy for a variety of projects, perfect for home and DIY use. Suitable for electric drills, drilling machines, milling machines, and factory machining centers.Features- Material: Steel.- Size: 12.20X1.20X1.20 cm/4.79X0.47X0.47 inch.- Made of high grade material, wonderful craftsmanship makes them not easy to bend or break.- Adopts precision production, with stable characteristics and high reliability, useful and practical.- It has a wide range of applications. It is very good whether it is used by yourself or used as gift.- Fine workmanship and simple appearance ensure its durability and practicality, good performance for accurate drilling.- Suitable for electric drills, drilling machines, milling machines, and factory machining centers.