Features Fine Workmanship: Exquisite craftsmanship with detailed display showcasing the high-quality construction. High Hardness and Torsion: Made from 40Cr material, ensuring high hardness, large torsion, and excellent toughness for reliable performance. Various Sizes: Easy to operate hex key set with various specifications, providing a secure grip and preventing slipping during use. Wide Application: Versatile set suitable for bicycle repair, building construction, machine repair, mechanical disassembly, car repair, and motorcycle repair. Strong 40Cr Material: Crafted from 40Cr material with good comprehensive mechanical properties and low temperature impact toughness for long-lasting durability. Features: 1. FINE WORKMANSHIP: Four workmanship carefully created, detailed display, highlighting the craftsmanship 2. PRODUCT ADVANTAGES: Hex key set come with High hardness, large torsion, good toughness, excellent quality 3. VARIOUS SIZES: Hex wrench is easy to operate, real material, not easy to slip, various specifications 4. WIDE APPLICATION: Can be used for bicycle repair, building construction, machine repair, mechanical disassembly, car repair, motorcycle repair 5. STRONG MATERIAL: 40Cr material has good comprehensive mechanical properties, good low temperature impact toughness Specification: Item Type: Hex Key Set System: Metric system Finish: Blacken Material: 40Cr Characteristic: Common Package List: 13 x Hex Key Package List 13 x Hex Key