Features: Double headed self tightening universal wrench, used for dismantling screws of various specifications. Made- of high-quality chromium vanadium- steel, with high hardness and rust resistance.Surface-matte-treatment, anti slip, high-torque. Wrench tooth design-, protecting threads-, suitable for various screws and nuts, a clamping nut of different sizes and shapes, suitable for various work scenarios. Wide application range: widely used in the automotive repair industry, mechanical disassembly, daily maintenance and other application fields-. Mechanical design-, time-saving and labor-saving, comfortable grip,for efficient operation: Specifications: Product name: Multifunctional self tightening wrench Material: Chromium vanadium- steel Color: Black、Silver Overall length: approximately 250mm/9.84in Thickness: 6mm/0.24in Usage range: 8-25mm Package Includes: 1PC Wrench note: Due to the different monitor- and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation- due to manual measurement.