Feature: 1. Carbide Material: This triangular twist drill bit is made of carbide, which is sturdy and wear resistant, not easy to corrode, and has a long service life. 2. Multiple Specifications: This triangular twist drill bit set has a variety of specifications to meet your different needs, you can choose to use it according to the set. 3. Efficient Drilling: This triangular twist drill bit can easily drill through tiles, glass and other materials, very efficient and labor saving. 4. Easy Installation: This triangular twist drill bit is very easy to install, you just need to install it to the power tool through the tail slot. 5. Wide Application: This triangular twist drill bit has a wide range of applications, which can be used for interior decoration, modeling, furniture processing and so on. Specification: Item Type: Triangular Twist Drill Bit Set Material: Carbide Size: Drill Length: 6mm/0.24in, Total Drill Length: 100mm/3.94in, Working Length: 56mm/2.2in, Drill Diameter: 6mm/0.24in, Shank Diameter: 4mm/0.16in Drill Length: 8mm/0.31in, Total Drill Length: 110mm/4.33in, Working Length: 70mm/2.76in, Drill Diameter: 8mm/0.31in, Shank Diameter: 6mm/0.24in Drill Length: 10mm/0.39in, Total Drill Length: 120mm/4.72in, Working Length: 75mm/2.95in, Drill Diameter: 10mm/0.39in, Shank Diameter: 7mm/0.28in Drill Length: 12mm/0.47in, Total Drill Length: 120mm/4.72in, Working Length: 75mm/2.95in, Drill Diameter: 12mm/0.47in, Shank Diameter: 9mm/0.35in. Package List: 7 x Drill Bit1 x Storage Case