Durable Material: Impact Cross Bits is made of high quality s2 alloy steel, high hardness, wear resistant, durable, can be used for a long time. Precision: Screwdriver Bit, precision craftsmanship and design, easy to use, precise and effortless. Great for furniture maintenance, electrician maintenance, etc. Easy To Use: The Impact Driver Bit Set is easy to install and remove, giving you a good experience with your tools. Application: The 1/4 hexagonal handle works with most electric screwdrivers, hand drill, making it a versatile tool for any jobs. Package Included: 5pcs screwdriver bit. Specification: Material: Alloy Steel Size Chart: Shank Diameter: 6.35mm/0.25inch 25mm: Length: 25mm/0.98inch, Blade Diameter: 7mm/0.28inch 50mm: Length: 50mm/1.97inch, Blade Diameter: 8mm/0.31inch 65mm: Length: 65mm/2.56inch, Blade Diameter: 9mm/0.35inch 70mm: Length: 70mm/2.76inch, Blade Diameter: 10mm/0.39inch 80mm: Length: 80mm/3.15inch, Blade Diameter: 11mm/0.43inch Package Includes: 5 Impact Bit Set Note: Please allow slightly errors due to manual measurement and different monitors.