Ultra Durable: This product is made of very high quality and durable carbon steel. The blade is hard and sharp. It is durable and wear-resistant, can be used for a long time for your various kinds of renovation work in wood drilling. Excellent Design: The high precision blade to increase grip, smooth cutting operation, no vibration, excellent impact resistance. The blade adopts arched design, with low cutting resistance, limited drilling speed and high working efficiency. The excellent design ensures that the hole is sharp and smooth without any broken edges, and the chip will not stick around and can be easily removed. Easy to Use and Safe: The drill bit can be easily installed on the drilling tool according to the instructions. After the confirmed fixation, you can start your work. The scientific cutting curve design ensures that the drill bit can work efficiently for a long time without any unnecessary burden on itself and the drilling tool. Application: With the 8 kinds of drill bits, you can do all kinds of drilling work. You can drill the holes you need in all types of wood, wood products, plastic, plywood, composite panels and other materials. The drill bit is suitable for hinged industrial installation, wood processing and maintenance, modeling, spherical door handle installation, drawer handle installation and other occasion Exquisite Packaging: We provide a nice wooden box to store these 8 bits, we have numbered number in the corresponding position, you can quickly get the size you need, the hole of the wooden box and of the sponge can provide effective protection. Thanks to this, it can also be a great gift for those who need it. Product description Specifications: Material: carbon steel Length: approx. 23cm / 9.06 Diameter: 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mmPackage Size: Approx. 25.5 x 18.5 x 2.5cm / 10 x 7.2 x 0.98