Deluxe 4 Hole Metal Punch - PUN-420.04 This new four-sized jewelry hole cutter/puncher is great for making cold connections The punches are heat treated and with the screw action, you can create clean holes in soft metals up to 22 gauge in thickness without deforming the metal By attaching the adjustable guide plate to the bottom of the punch, you can also create multiple pieces with holes at the exact locations on each piece Hole sizes fit 18 (1.1mm), 16 (1.4mm), 14 (1.7mm) and 12 (2.15mm) gauge wires