... be used in iatrical instruments,chemical industry,plastic hard ware,scent bottle sprayer,valve,nail polish,air ... a type of modern steel and famous for its high corrosion resistant, wear resistance, strength and hardness ... Rockwell or higher. Martensitic Grades are known for high hardness and allowances must be made for poor ... further Information,Plz contact us! 8mm High Quality Stainless steel ball