These faithfull punches are made from uniformly heat treated carbon steel and are used for removing pins in parallel holes the removal of the pins should first be started with a hand or taper punch to avoid damage to the end of the parallel punch a 4 piece set is available and contains 3 4 5 and 6mm a 8 piece set is also available and contains 15 25 3 4 5 55 6 and 8mm