13.75-15.25mm/15.25-17mm/17-19mm/19-21mm/21-23mm/23-26mm/26-29.5mm/29.5-33.5mm/33.5-38mm/38-44mm/44-54mm/54-64mm/64-74mm/74-84mm (optional). Material: HSS. Can achieve the required roundness, straightness, and concentricity of the hole.
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