Counterbore Twist Step Drill 90/180 Degree Cobalt-containing HSS Metal Drilling Chamfer Step Drill

Features:

1.135 ° double back angle design, drilling sharp, smooth chip removal.
2. Fast drilling speed and higher efficiency.
3.Compatible equipment: Machining center, table drill.
4.Scope of application: cast iron, mace, aluminum, alloy steel, iron, mold steel, low carbon steel, plastic, wood and other materials.