... iatrical instruments,chemical industry,plastic hard ware,scent bottle sprayer,valve,nail polish,air condition,medical material,automotive fittings.Material Composition ... is being used in rolling element bearings, valve seats, casters, ball bearings and valve parts.420C is a martensitic stainless steel with ... ,G16,G14,G12,G10Any further Information,Plz contact us! 8mm High Quality Stainless steel ball