3 4 adjustable constant force spring

{"cid":"91180549","title":"SS301 Torsion Spiral Spring Constant Force Thickness Customized For Tape Measures","imgUrl":"https:\/\/img.silkroadsl.com\/nimg\/d0\/63\/2788118e9909a4e4072388ca79ff-200x200-1.jpg","attrs":{"Price":"negotiation","Brand Name":"NV","Model Number":"NV-0036","Minimum Order Quantity":"100PCS","Delivery Time":"10 to 14 work days","Certification":"ISO9001","Place of Origin":"CHINA","Payment Terms":"L\/C, , T\/T, Western Union","Supply Ability":"2 000 000PCS\/month","Packaging Details":"carton packing","Material":"SS301","end":"with hole","Tolerance":"0.01mm","Thickness":"0.08-1.8mm","Length":"100mm to 800mm","Width":"10mm to 50mm"}}