Features: Made from Carbides, which makes cutting sharper, durable, unhindered chip removal and with excellent drilling ability and excellent drilling performances. It is head adopt curves double-edged designs, quick waste removal and ensuring that you work efficiently. The middle of each chisels ensure accurate drilling and prevents walking and wobbling during operation. Create perfectly round and accurate holes with the middle track designs. Wide ranges of uses: suitable for drill, benchs drill, vertical drill, hand drill, motor-driven stand drill and magnetic tape drill with mobile tape, etc. Can be used for perforation of wood product, mounted doors, shooting tip, drawer, plastic product, etc. Specifications: Material: Alloy Style diameter: 15mm (0.59inch)/20mm (0.79inch)/25mm (0.98inch)/30mm (1.18inch)/35mm (1.38inch) Length: Approx. 78mm/3.07inch Handle diameter: Approx. 7mm/0.27inch Package Includes: 1x Drill Bit note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.