Precision Blade: This helical wood bit bit set is designed with high precision blade to increase grip, smooth cutting operation with excellent impact resistance. And the blade adopts arched design, limited drilling speed and high working efficiency. The excellent design ensures that the hole is neat and smooth without any broken edge, and the chip will not stick around and can be easily removed. Wood Drilling: This helical wood drill bit set 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. Scope: This twist drill bit set allows you to do all kinds of drilling jobs. And you can drill the holes you need in all types of wood, wood products, plastic, plywood, composite panels and other materials. And it is suitable for hinged industrial installation, wood processing and maintenance, modeling, ball door handle installation and other occasion. Materials: This spiral wood drill bit set is made of carbon steel with the hard and sharp blade, which makes it wear and rust resistant to give you stable performance and maximum durability. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.