Material: HSS high speed steel. - Applicable to materials of wood board, plastic, copper plate, aluminum alloy, stainless steel, etc. 13 Drill Bit (1.5/2/2.5/3/3.2/3.5/4/4.5/4.8/5/5.5/6/6.5). - Made of selected HHS high speed steel, featuring high hardness & good wear resistance & long service life.
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