These pliers punch 1.5mm holes on metal sheets up to 20 gauge. Creates smooth, clean holes with no barbs or rough edges. In addition, with gauge guards, the area around the hole is not unsightly indented. How to use the gauge guard: Shut down pliers When properly adjusted, there is enough space to insert the metal piece between the widest part of the pin and the bottom of the pliers jaw. If the metal doesnt fit or extra space, simply rotate the gauge guard screw to the right to expand the jaw slightly. (Move right for heavier gauges and left for lighter gauge) Note: If the adjustment screws are not set properly, the extra stress and tension on the jaws of the pliers may damage the pliers. Dimensions: 6 inches long and 2.25 inches wide The hole punch is 1.5mm in diameter and can pass through 20 gauge wire or thinner. Includes one replacement pin Quantity: 1 x BeadSmith 1.5mm Metal Hole Punch Pliers