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By certification 
The clamping device is designed as per the client requested and manufactured by SS or CS material, especially inner side contacting with the part section is SS material. This clamping device is used for the parts/device testing, and the testing parts/device will be fixed on the clamping device. Normally it can be CS material but sometimes it is can be SS too.
http://www.zymanufacturing.com/
