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♔Operation requirements and replacement methods 1.Knife and blade need to be constantly refueling, especially when cutting aluminum plates. 2.When cutting, the incision of the cutter bar must be perpendicular to the work piece that needs to be cut, so as to prevent the cutter from breaking. 3.Knife replacement: open the protective cover, take out the nut, release the fastening screws, pull the cutter bar with the pliers, reinstall the cutter bar, and squeeze the screws tightly. 4.Replacement of tool holder:turn the pressing cap counterclockwise and replace the new knife holder. ♔Technical Parameters 1. Select 8 mm electric or pneumatic drill with a speed of 1500-3000 RPM / min. 2. Minimum cutting radius 12 mm 3.Allowable cutting thickness:Ordinary iron plate 1.8 mm, Stainless steel plate 1.2 mm, Copper and aluminum plate 2 mm, Plastic plywood 2 mm ♔Package included 1 x Nibbler cutter 1 x Extra nibbler punch 1 x nibbler die 1 x Hex key 1 x Plastic handle 1 x Iron case 1 x User manual