Features: Made from tough alloy blend for excellent wear resistance and shock absorption. The reinforced center maintains stable function under heavy pressure, preventing cracks or bending. Manufactured using modern automated shaping systems for consistent accuracy and proper fitting. Each unit is precisely crafted to improve grip and deliver smooth driving results. Features dark manganese phosphate outer layer for better rust prevention. Functions effectively in wet or tough environments, ensuring prolonged usage time. Strengthened through professional heating processes to increase toughness and reduce breakage risks. This approach extends working duration during rigorous rotational applications. The star shape structure delivers excellent rotational power transfer for firm fastening. Prevents slipping during strong turning motions, suitable for various screw driving tasks. Specifications: Quantity: 15PCS Component: alloy steel Length: 50mm/1.96inch Properties: Rice-shaped design | twist resistance | effect resistance face care: black manganese phosphate anti-rust Technical parameters: Heat care to increase strength | Anti-rust design Package Includes: 1 Set Screwdriver Bits 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.