Constructed from tempered, high carbon tool steel, the Large Cutter Set includes 4 punches: 1 1/4" , 1 1/2" 1 3/4" 2". Lever style opener is used to spread the die plates apart and to apply clamping pressure to the metal being cut. The tool's holes have been machined and honed to make fine, clean cuts. The punches are oil-quenched tool steel that have been drawn for hardness and durability. The base is case-hardened and ground. You can cut soft sheet up to 18ga. Block dimensions are 3" x 3-1/4" x 1-1/4" high.