【Heavy-Duty Material】The screwdriver bit is made of chromium-vanadium alloy steel, which is durable, impact-resistant, wear-resistant and durable. All tools have high hardness. 【Wide Range Of Applications】You can use this necessary tool to apply for loosening or tightening fasteners.The screwdriver set have many types of screwdriver bits, suitable for different occasions, and can meet your various needs 【Non-Slip Comfortable Handle】non-slip grip, comfortable to hold and operate.Improve the efficiency of use, so you can complete the work more easily. 【Special Suitcase】easy to carry and use, all tools are stored with the suitcase.Easy to carry around, not easy to lose, each tool has its specific storage location. 【Good Performance】The impact force helps loosen rusty or fro-zen screws without causing damage., Weight: 1.984160358 Pounds, Manufacturer: Gonnely