Features: Crafted from premium alloy steel, this 14 piece hollow security driver bit set delivers exceptionally hardness and wear resistance for prolonged durability and 1/4" adapter applications. Precise sandblasted surfaces enhances corrosions resistance while reducing friction during screwdriving operations in demanding environments. Designed for professional technicians and DIYer enthusiasts requiring reliabled torques transmission for precise tasks in automotive, electronics, and machinery maintenance. Optimized for workshop repairs, home appliance installations, and industrial equipment servicing where tamper proof fasteners demand special hollow cores bit compatibility. The integrated magnetic storage strips securely organizes all 14 hollow tamper proof bits, maintaining tool accessibility for efficient workflow in confined spaces or mobile repair scenarios. Specifications: Component: alloy steel Length: 25mm/0.98inch Package Includes: 14 Piece Hollow Driver Bit note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color. Thanks for your understandings.