Material and finish: Carbon steel with black surface treatment. Some variants are described as stainless steel with hardness, rust resistance, and durability. Product specifications: Hex wrench sizes available in 3 mm, 4 mm, 5 mm, 6 mm, 8 mm, 10 mm, 12 mm, and 16 mm. Durability and corrosion resistance: Made of stainless steel with hardness, offering rust resistance, strength, and durability. Locking performance: Strong locking using precision hexagonal socket screws for fastening; screws provide strong tightness, stability, and resistance to slipping. Key benefits: Wide size range fits common hex bolts, material construction offers durability and corrosion resistance, reliable locking prevents loosening during use, suitable for demanding environments. How it helps solve problems: Ensures secure fastenings in assemblies exposed to vibration or load, reducing maintenance and rework. Use scenarios: 1) Assembling metal or wooden furniture that uses hex bolts, ensuring joints stay tight over time. 2) Bicycle maintenance, such as installing or removing components that use hex socket fasteners in the specified size range. 3) General mechanical or workshop use for tightening or securing machinery frames, housings, or equipment where durable, slipresistant fasteners are required.