Features: Regularly add oil to the cutting edges of cutter, especially when cutting aluminum plates. Turn on the drill first, then cut, and when finished, exit first and then turn offs the drill. When cutting, the cutting edges of cutter holder must be keep perpendicular to the workpiece being cut to prevent cutter from breakings due to hard deformation. cutter holder replacement: Open the protective cover, remove the antiloosening nut, loosen the set screw, use pliers to pull out cutter holder, reinstall cutter holder, and tighten the screw. cutter holder replacement: Rotate the clamping caps counterclockwise and replace it with a new cutter holder. Specifications: Component:Steel,ABS Package Includes: 1Set Sheet Metal Nibper note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color.