NIUNIU [High quality] Made of high-quality high-carbon steel, fully quenched and tempered, high hardness and good toughness, not easy to wear and break, and long service life [Rapid drilling] With the help of two auxiliary milling cutters and an innovative automatic retracting threaded tip, wood can be grasped firmly and quickly, and chips can be removed efficiently and smoothly [Easy to use] Suitable for all drill bits with hexagonal shank bit sleeves, can be installed in all power tools more safely, and come with extension rods, and have a small hole drilled through the flat part [Applicable] It's universal for the most drill driver tool of brands in the markets. Widely used in woodworking openings and drilling, used to perforate cork, medium hard wood, particle board, gypsum board and plastic and others Delivery Quantity: 1set of 15pcs, Package Contents: Only the above package contents, excluding other products. Size: Specifications 6-25 (6-8-10-12-13-14-16-18-19-20-22-24-25-), 150MM connecting rod (Reminder: The size is measured manually, please allow 1-2 cm measurement error) Color: silver (Due to different monitors and lighting effects, the actual color of the item may be slightly different from the color shown on the picture.)