1. Material: These screwdriver heads are crafted from quality K5 alloy with a hardness of up to 62 HRC, ensuring long lasting performance and reliability even under intense working conditions 2. Magnetic: Equipped with excellent magnetism, these impact drill bits effortlessly pick up and securely hold screws without slipping or falling off, providing an effortless working experience and improving overall efficiency 3. Nonslip: Featuring nonslip fine teeth and nonslip serrated blades for superior grip and stability, these bits effectively avoid cams from falling off and ensure a precise and tight fit for screws, resulting in increased drilling efficiency and accuracy 4. Versatility: Designed for versatility, these bits are compatible with a wide range of tools including impact drivers; electric screwdrivers; drills and more for a wide range of applications from home repairs to professional projects 5. Product Size: The Phillips screwdriver bits are available in lengths of 1 inch/25 mm; 2 inch/50 mm; 2.6 inch/65 mm; 2.8 inch/70 mm; 3.5 inch/90 mm and 6 inch/150 mm. Different sizes can meet your different needs. And they are easy to carry or store Product Name:Impact Screwdriver Bit Set Size:1in/25mm, 2in/50mm, 2.6in/65mm, 2.8in/70mm, 3.5in/90mm, 6in/150mm Shank:diameter 1/4in (6.35mm) Color:As Shown Material:Alloy Steel Package Contents: 20 x drill bits(4pcs of each Size in 25/50/65/70/90 mm) 2 x 150 mm drill bit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.