Detailed product description:1.ISO9000 Certificate2.SGS Certificate3.Lower price4.Short delivery time5.Many types to choose6.Package:carton box or wooden or iron case7.Material: spring steel 28MnSiB or 60Si2Mn8.Thickness:3-8mm9.Hardness: HRC44-4810.Hole size:Full size11.Coating:stoving varnishWe ept OEM and ODM order ,and offer high-quality service for you.After inspection and testing, our product is in line with the requirements of the technical agreement,performance qualified. If you have other requests, please contract the way the addition of the official presentation of the specific requirements.We will do our best to meet various requirements of customers.