Standard heavy-duty industrial grade punches have 3 cutting points to ensure a balanced punching action. This minimises any bending forces on the tie-bolt and at the same time maximises the tonnage on each cutting point. ......Standard heavy-duty industrial grade punches have 3 cutting points to ensure a balanced punching action. This minimises any bending forces on the tie-bolt and at the same time maximises the tonnage on each cutting point. These punches are ideal for mild steel and thinner grades of stainless steel. Bulldog punches are intended for use on heavier grades of stainless steel where a greater tonnage is needed. These punches have two edges which split the blank in two and then sheer round the circumference. Refer to punch sizes for the full range of punches. Special sizes can be made to order. All SML dies have 4 scribe lines to ensure accurate positioning