Features: 1.Includes 6pcs interchangeable punch head sized 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm to easily punch different s of round holes. 2.Non-slip knurling design allows to grasp the punch tool steadily so you can punch hole more accurately. 3.Gently punch a circle with the punch to make sure it is the hole you want. 4.Hit the butt of the hole punch with a standard hammer. 5.It is best to use medium density wood or plastic as a backing. specification: Includes 6pcs interchangeable punch head sized 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm to easily punch different s of round holes. Non-slip knurling design allows to grasp the punch tool steadily so you can punch hole more accurately. Gently punch a circle with the punch to make sure it is the hole you want. Hit the butt of the hole punch with a standard hammer. It is best to use medium density wood or plastic as a backing. : Material: Steel Color: Black, Silver Punch Head Size: 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm Package List: 1 x Punch Tool 1 x Wrench 6 x Punch Head