... 1)Material: zinc alloy 2)Tolerance: +/- 0.005mm 3)Finish:Polishing , plating 4)Color:gray,white,black aluminium casting 1)Material: ... zinc alloy2)Tolerance: +/- 0.005mm 3)Finish:Polishing , plating4)Color:gray,white,black,as ... , torsion tester, tensile force tester,etc. 3 ) Materials: zinc alloy 4) Finish: Anodized, Polishing, zinc plated , nickel plated , ...