... tensile force tester,etc 3 ) Materials:Different kinds of stainless steel, (303,304, 316 Etc) Brass ( C3602, C3604, lead ... -free, Etc) , aluminum( 6061,6063 Etc.) , steel, etc. 4) Finish: Anodized, Polishing, zinc plated , nickel plated , ... , computer, optical fiber products , medical equipment, mobile phone, Camera ,gas stove, gas heater, furniture etc. bolts screws stainless ...