ITEM NAME:1 pcs Nitrided Step Drill Drill Bit for Workpieces w/ a Hardness of Less Than 25.Scope of application: suitable for workpieces with a hardness of less than 25, such as carbon steel, thin iron plate, insulating board, PVC board, wood board, etc., whose thickness is less than 5MM. Handle: Triangular round shank 12mm shank.
