Vogel Perf-Arc units offer both low cost and versatility for your piercing applications. Units can be used individually, or in multiples, to pierce all holes in a part simultaneously. DD style units pierce a hole top & bottom in unit, and may be ordered to produce one size hole on top and a different size on bottom. Punches are easily sharpenable. Because Perf-Arc units contain the full circumference of the tube, no OD bulging will occur. Units are self-stripping. Each tool is made for a specific size tube and hole, up to maximums shown in charts below. Demountable units may be easily changed to new hole sizes simply by ordering additional perforators.