... ,,iron ally,hard metal. 3Tolerances:+/-0.5% of dimensions. Electric power tool made by process of metal injection molding. 2.Material:stainless steel, ... steels, stainless steels, low expansion alloys (kovar and invar), tool steels, soft magnetic alloys, super alloys, to conductive materials ( ... order of ±0.3 to 0.5%, albeit specific dimensions can be held as close as ±0.1%. electric power tool of metal ...