1. High quality chrome vanadium steel forging, hardness up to HRC55, overall heat treatment, high hardness, large torque, good toughness, high strength and durability.2. Multifunctional design, various models, equivalent to buy one = buy eight, all kinds of maintenance, not afraid of no tools. Key ring design, wear around the waist, small size, convenient and practical.3. The surface of the wrench is electroplated, beautiful and not easy to rust. The handle is blue anodized to prolong the life of the product.4. Exquisite workmanship, split design, each can be opened separately, and the tightness of the wrench can be adjusted.5. Simple appearance/double hump + middle groove design, scientific storage groove, simple and exquisite appearance, thumb can be properly placed in the middle groove when using, easy to operate.