Model: Spring Steel Extension SpringType：Dual hookMaterial: Spring SteelWire Diameter: 2mm.Outer Diameter: 12mm.Free Length: 40-100mm.Size: Wire Diameter x Outer Diameter x Lengthe.g: 1.5x12x90mm; means Wire Diameter=1.5mm Outer Diameter=12mm Length=90mmFeatures:Made of spring steel material not easy to rust, more durable.The products are forged by many processes, and strictly control each production process, surface gloss without burrs.Quality stainlless steel raw materials, processed, quality assurance, the spring pitch is even, the grain is clear, the force is symmetrical, and the resilience is stable.High plasticity, good fatigue resistance and uniform stress, more firm, the bar appearance of trachoma and black spots, the details of fine, good texture.