Product Name: Door and Window Hardware Torsionspring for Industrial Door Model NO.: ES-1004 Shape: Coil Production Process: Cold Roll Load Type: Torsion Usage: Industrial, Auto, Home Appliance, Garage Door Material: Steel Function: Buffer Length: 500-3500mm Diameter of Wire: 5-11.5mm or Customized Trademark: Everbright or OEM Transport Package: The Products Are Packed in Carton by Sea Specification: Customized Origin: China HS Code: 7320209000 Product Description ModelETS-5-1/4Wire diameter3-12mmSpring outside diameter50-180mmSpring inside diameter1-3/4-12mmEverbright torsion springs are manufactured from oil-tempered spring wire. Wire is coatedfor improvedcorrosion resistance and earlier handling. Standard 10000 cycle and 25000 + high cycle springs are available in both left or right wound, precut with fittings installed or in long longth. We have different models for you choose. Also, we can customize door brackets according to your requests.