1Includes 6pcs interchangeable punch head sized 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm to easily punch different specifications of round holes. 2Non-slip knurling design allows to grasp the punch tool steadily so you can punch hole more accurately. 3Gently punch a circle with the punch to make sure it is the hole you want. 4Hit the butt of the hole punch with a standard hammer. 5It is best to use medium density wood or plastic as a backing.
